Sample records for MATERIA OSCURA (dark matter)
from WorldWideScience.org

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1

La materia oscura del universo: retos y perspectivas

Vázquez-González, A; Matos, T
2008-12-01

Resumen en español Entender la naturaleza de la materia oscura es uno de los retos más importantes de la física actual. En este trabajo se da una introducción didáctica a este tema, haciendo énfasis en los resultados observacionales que dan sustento a la existencia de la materia oscura. Se platica de los candidatos a este tipo de materia, de sus ventajas y problemas, además de las perspectivas inmediatas para entender su naturaleza Resumen en inglés Understanding the nature of dark matter is one of the greatest challenges of modern physics. This paper gives an introduction to teaching this subject, doing an emphasis on the observational results that give sustenance to the existence of dark matter. We talk about candidates for this king of matter, its advantages and problems, in addition to the immediate prospects for understanding the nature of it

Scientific Electronic Library Online (Spanish)

2

Materia y energía oscuras, ¿que son?

Caldera-Cabral, G.A; Ureña-López, L.A
2007-08-01

Resumen en español Uno de los problemas más importantes de la cosmología actual es el determinar la naturaleza de la materia oscura y la energía oscura. Presentaremos un resumen de las evidencias observacionales de la existencia de la materia oscura, y se revisaran algunos de los posibles candidatos propuestos en la literatura. De igual manera, describiremos modelos dinámicos de energía oscura como Quintessence y Phantom. Resumen en inglés One of the most important problems in modern cosmology is the determination of the nature of dark matter and dark energy. We present a summary of the observational evidence for the existence of dark matter, and we make a revision of some of the candidates that appear in the literature. Likewise, we describe dynamical models for dark energy in the case of Quintessence and Phantom energy.

Scientific Electronic Library Online (Spanish)

3

G. W. Leibniz: De la Biología a la metafísica. La Respuesta vtalista de Leibniz: Una ontología unificada/ G. W. Leibniz: From biology To methaphysic. Leibniz´S vitalist answer: A unified ontology

Rodero, Sergio
2009-06-01

Resumen en español Para Leibniz nuestros cuerpos tienen perfección, o sea, vida. Ahora bien, cada parte de esta materia viva que los compone sería demasiado privilegiada si ella sola tuviera una ventaja que la distinguiera infinitamente y esencialmente de todas las otras que la rodean: es, por lo tanto, necesario que haya vida y percepción por todas partes. Así, pues, podemos afirmar que, en virtud del principio de uniformidad, no puede haber más que una diferencia gradual -en variedad (mas) de perfección- entre lo orgánico y lo inorgánico: tan llena de vida está la piedra como el cuerpo humano, y no hay entre estas dos cosas -sub specie aeterni- distinción alguna: “en el fondo” son lo mismo. La vida consiste básicamente, para Leibniz, en tener percepción y appetitus. Ahora bien -prosigue la uniformidad analógica-, como nuestras percepciones a veces son nítidas, conscientes o reflexivas y otras veces son confusas y oscuras, es natural decir que habrá seres vivos cuya percepción será oscura, confusa y sin reflexión. Resumen en inglés For Leibniz our bodies have perfection, that is to say, life. Each part of this live matter which composes them would be too privileged if it alone had an advantage that distinguished it infinitely and essentially from all the other that surrounding it: is, therefore, necessary that there be life and perception everywhere. Thus, therefore, by virtue of the principle of uniformity, there cannot be more than a gradual difference - in variety of perfection- between the organ (mas) ic thing and the inorganic thing: so full of life it is the stone as the human body, and there is not between these two things -sub specie aeterni- any distinction. In substance they are the same thing. Life consists basically, for Leibniz, in having perception and appetitus. Since our perceptions at times are clear, conscious or with reflection, and other times confused and dark, it is natural to say that there will be live beings whose perception will be dark and confused and without reflection.

Scientific Electronic Library Online (Spanish)

4
5

What is the invisible web? A crawler perspective

Arroyo, Natalia

The invisible Web, also known as the deep Web or dark matter, is an important problem for Webometrics due to difficulties of conceptualization and measurement. The invisible Web has been defined to be the part of the Web that cannot be indexed by search engines, including databases and dynamically g...

DRIVER (Spanish)

8

Variability in plankton community structure, metabolism, and vertical carbon fluxes along an upwelling filament (Cape Juby, NW Africa)

Arístegui, Javier; Barton, Eric D.; Tett, Paul; Montero, María F.; García-Muñoz, Mercedes; Basterretxea, Gotzon; Cussatlegras, Anne-Sophie; Ojeda, Alicia; Armas, Demetrio de
2004-10-13

Digital.CSIC (Spain)

9

Trends in Space Astronomy and Cosmic Vision 2015-2025

Turon, Catherine; Done, Chris; Quirrenbach, Andreas; Schneider, Peter; Aerts, Conny; Bazzano, Angela

To be published in the proceedings of the 2005 ESLAB Symposium "Trends in Space Science and Cosmic Vision 2020", held at ESTEC, 19-21 April 2005, F. Favata (ed). | As a short introduction to the astronomy session, the response of the community to the Call for Themes issued by ESA and the specific th...

DRIVER (Spanish)

10

Trends in Space Astronomy and Cosmic Vision 2015-2025

Turon, Catherine; Done, Chris; Quirrenbach, Andreas; Schneider, Peter; Aerts, Conny; Bazzano, Angela; Cernicharo, José; De Bernardis, Paolo; Goobar, Ariel; Henning, Thomas; Ivison, Rob J.; Kneib, Jean-Paul; Meurs, Evert; Van Der Klis, Michiel; Viana, Pedro; Volonte, Sergio; Zeilinger, Werner W.
2005-10-28

Digital.CSIC (Spain)

13

The energetic Universe

Barcons, Xavier
2005-08-09

Digital.CSIC (Spain)

14

The degenerate gravitino scenario

Vives, Óscar; Ruiz de Austri, Roberto; Boubekeur, Lotfi; Choi, Ki-Young
2010-04-07

Digital.CSIC (Spain)

16

The Hunt for New Physics at the Large Hadron Collider

AHEP Group; Valle, José W. F.; Hirsch, Martin; Morisi, Stefano; Heinemeyer, Sven; Nath, P.
2010-05-05

Digital.CSIC (Spain)

17

Supersymmetry parameter analysis: SPA convention and project

Allanach, B. C.; King, S. F.; Blair, G.A.; Kraml, S.; Kim, C. S.; Bagger, J. A.; Barnett, Stephen M.; Ellis, John; Hou, Wei-Shu; Roy, P.; Yamada, Y.; Han, L.; Heinemeyer, Sven; Martyn, H.-U.; Moultaka, G.; Mondragon, M.; Sphicas, P.; Mori, T.; Siyeon, K.; Mukhopadhyaya, B.; Muanza, S.; Baer, H. A.; Stöckinger, D.; Nauenberg, U.; Tait, T.; Hidaka, K.; Gunion, J.; Rückl, R.; Weber, Ch.; Hirsch, Martin; Hinchliffe, I.; Djouadi, A.; Porod, Werner; Peskin, M.; Xing, Z.-Z.; Plehn, T.; Arnowitt, R.; Diaz, M. A.; Balazs, C.; Quevedo, F.; Hohenwarter-Sodek, K.; Kernreiter, T.; Zhu, S.-H.; Hurth, T.; Battaglia, Marco; Öller, W.; Hesselbach, S.; Hollik, W.; Kovarik, K.; Kneur, J.-L.; Jiang, Y.; Zerwas, P. M.; Belyaev, A.; Reuter, J.; Langacker, Paul; Valle, José W. F.; Mühlleitner, M. M.; He, H.-J.; Spira, M.; Nojiri, M. M.; Majerotto, W.; Moortgat-Pick, G.; Moretti, S.; Haber, H. E.; Hagiwara, K.; Boos, E.; Carena, M.; Aguilar-Saavedra, J. A.; Miller, D. J.; Nowak, H.; Nomura, D.; Kang, S. K.; Okada, N.; Lafaye, R.; Erler, J.; Wienemann, P.; Polesello, G.; Jones, D. R. T.; Fritzsche, T.; Zerwas, D.; Bélanger, G.; Bartl, A.; Yang, J. M.; Richardson, P.; Rolbiecki, K.; Schleper, P.; Kilian, W.; Rzehak, H.; Bechtle, P.; Freitas, A.; Kane, Gordon L.; Fraas, H.; Kalinowski, J.; Kamon, T.; Jack, I.; Eberl, H.; Logan, H. E.; Dutta, B.; Dutta, S.; Barger, V.; Wagner, C. E. M.; Ma, W.-G.; Rainwater, D.; Berger, E. L.; Desch, K.; Gounaris, G. J.; Godbole, R. M.; Zhang, R.-Y.; Guasch, J.; Olive, K. A.; Kittel, O.; Klasen, M.; Krämer, M.; Skands, P.; Weiglein, G.; Slavich, P.; Zhang, X.; Deppisch, F.; Ali, Aejaz.; Choi, S. Y.; Han, T.; Tovey, D. R.; Haba, N.; Roeck, Albert De; Matchev, Konstantin T.
2006-04-01

Digital.CSIC (Spain)

19

Supersymmetric Models: Phenomenological and Dark Matter Analyses

López Fogliani, Daniel E.

Tesis doctoral de la Universidad Autónoma de Madrid, Facultad de Ciencias, Departamento de Física Teórica y del Instituto de Física Teórica (IFT-CSIC/UAM).-- Texto en inglés e introducción, contenidos de la tesis y conclusiones finales en castellano.-- Fecha de lectura: 30-05-2007. | Este trabajo de...

DRIVER (Spanish)

20

Supersymmetric Models: Phenomenological and Dark Matter Analyses

Muñoz, Carlos; López-Fogliani, Daniel E.
2007-05-01

Digital.CSIC (Spain)

21

Sterile neutrino dark matter in B-L extension of the standard model and galactic 511 keV line

Khalil, Shaaban; Seto, Osamu

PACS numbers: 95.35.+d, 13.15.+g, 98.80.Cq, 98.70.Rz.-- 10 pages, 1 figure. | Sterile right-handed neutrinos can be naturally embedded in a low scale gauged U(1)_{B-L} extension of the standard model. We show that, within a low reheating scenario, such a neutrino is an interesting candidate for dark...

DRIVER (Spanish)

23

Stau detection at neutrino telescopes in scenarios with supersymmetric dark matter

Canadas, B.; Cerdeño, David G.; Muñoz, Carlos; Panda, S.
2009-04-27

Digital.CSIC (Spain)

24

Statistical analysis of galaxy surveys – I. Robust error estimation for two-point clustering statistics

Norberg, Peder; Baugh, Carlton M.; Gaztañaga, Enrique; Croton, Darren J.
2009-05-01

Digital.CSIC (Spain)

25

Standard model) universe dominated by the right matter

Barenboim, Gabriela; Vives, Óscar

14 pages, 3 figures. References on late time enthropy release included, several points clarified. PACS numbers: 14.60.Pq, 98.80.Cq. ArXiv pre-print available at http://arxiv.org/abs/0806.4389 | We analyze the phenomenology of a prolonged early epoch of matter domination by an unstable but very long-...

DRIVER (Spanish)

27

Seasonal and short-time-scale dynamics of microplankton community production and respiration in an inshore upwelling system

Moncoiffé, Gwenaëlle; Álvarez-Salgado, Xosé Antón; Figueiras, F. G.; Savidge, Graham
2000-04-01

Digital.CSIC (Spain)

28

SUSY-GUTs, SUSY-Seesaw and the neutralino dark matter

Calibbi, Lorenzo; Mambrini, Yann; Vempati, Sudhir Kumar

19 pages, 7 figures.-- ISI Article Identifier: 000249788800048.-- ArXiv pre-print available at: http://arxiv.org/abs/0704.3518 | We will consider a SUSY-SU(5) with one right-handed neutrino with a large top like Yukawa coupling. Assuming universal soft masses at high scale we compute the low-energy ...

DRIVER (Spanish)

29

SUSY-GUTs, SUSY-Seesaw and the neutralino dark matter

Calibbi, Lorenzo; Mambrini, Yann; Vempati, Sudhir Kumar
2007-09-19

Digital.CSIC (Spain)

30

Robust neutrino constraints by combining low redshift observations with the CMB

Mena, Olga; Reid, Beth A.; Verde, Licia; Jiménez, Raúl
2010-01-04

Digital.CSIC (Spain)

31

Right-handed sneutrino dark matter in the NMSSM

Cerdeño, David G.; Seto, Osamu
2009-08-26

Digital.CSIC (Spain)

32

Right-handed sneutrino as thermal dark matter

Cerdeño, David G.; Muñoz, Carlos; Seto, Osamu

4 pages, 2 figures. | We study an extension of the MSSM with a singlet S with coupling SH1H2 in order to solve the μ problem as in the NMSSM, and right-handed neutrinos N with couplings SNN in order to generate dynamically electroweak-scale Majorana masses. We show how in this model a purely right-h...

DRIVER (Spanish)

33

Right-handed sneutrino as thermal dark matter

Cerdeño, David G.; Muñoz, Carlos; Seto, Osamu
2008-07-18

Digital.CSIC (Spain)

35

Radio Signal by Galactic Dark Matter

Miele, Gennaro; Borriello, E.; Cuoco, A.
2009-05-01

Digital.CSIC (Spain)

36

Prospects for the direct detection of neutralino dark matter in orbifold scenarios

Cerdeño, David G.; Kobayashi, Tatsuo; Muñoz, Carlos

51 pages, 25 figures. | We analyse the phenomenology of orbifold scenarios from the heterotic superstring, and the resulting theoretical predictions for the direct detection of neutralino dark matter. In particular, we study the parameter space of these constructions, computing the low-energy spectr...

DRIVER (Spanish)

37

Prospects for the direct detection of neutralino dark matter in orbifold scenarios

Cerdeño, David G.; Kobayashi, Tatsuo; Muñoz, Carlos
2007-09-06

Digital.CSIC (Spain)

38

Prospects for dark matter detection with IceCube in the context of the CMSSM

Trotta, R.; Ruiz de Austri, Roberto; Heros, C. P. de los
2009-08-26

Digital.CSIC (Spain)

39

Prediction for the lightest Higgs boson mass in the CMSSM using indirect experimental constraints

Buchmueller, O.; Cavanaugh, R.; De Roeck, A.; Heinemeyer, Sven; Isidori, Gino; Paradisi, Paride; Ronga, F. J.; Weber, A. M.; Weiglein, G.
2007-10-11

Digital.CSIC (Spain)

41

Petrográfica y Geoquímica de la dolomía hospedante de una mineralización de Zn y Pb. Puesto Gregor, Neuquén, Argentina/ Petrography and geochemistry of a Zn- Pb mineralization hosted in a dolostone, Puesto Gregor, Neuquen, Argentina

Gómez, M. Cristina; Garrido, Mirta; Cesaretti, Nora; Domínguez, Eduardo
2008-07-01

Resumen en español En la Cuenca Neuquina (Argentina) y asociada a la Formación Lajas (Jurásico) se mencionó por primera vez una mineralización de esfalerita y galena asociada a carbonatos. En el área del yacimiento Puesto Gregor, ésta Formación está constituida por una secuencia clástico carbonática. Para caracterizar el ambiente de depositación de la dolomía hospedante de la mineralización de Zn y Pb se realizaron estudios petrográficos y geoquímicos. Entre los últimos los (mas) más utilizados son los análisis e interpretación de isótopos estables (O, C), elementos mayoritarios y trazas e inclusiones fluidas. En el horizonte dolomítico de 0,90 m de espesor y 300 m de corrida se distinguen petrográficamente dos tipos de dolomita: el primer tipo es penetrativo, sin preservación de la fábrica sedimentaria original y es anterior a la mineralización, el segundo tipo está vinculado a la precipitación de sulfuros y consiste en una dolomita de tipo silla de montar (saddle). El estudio de las inclusiones fluidas en la dolomita penetrativa indica la presencia de fluidos orgánicos y fluidos acuosos. Determinaciones microtermométricas sobre inclusiones fluidas acuosas revelaron temperaturas de 140º C. Geoquímicamente la capa presenta proporciones casi estequiométricas y promedios de CaCO3 y MgCO3 iguales al 52 y 48% molar, respectivamente. En cuanto a los elementos trazas, el Sr varió entre 79 y 159 ppm y el Na entre 74 y 225 ppm. Los contenidos de Mn y Fe son mucho más altos que los valores determinados para estos elementos en rocas carbonáticas. El contenido en ETR es bajo y los diagramas de ETR muestran una anomalía negativa de Ce y de Eu. Se determinaron valores de isótopos de C y O. Los valores de ä13 C (VPDB) entre -2,9 y -9 0/00 no son coherentes con los datos informados para calizas marinas de edad jurásica mientras que los valores de ä18O(VPDB) entre -2,6 y -4 0/00 coinciden con los valores informados para carbonatos de igual edad. Los datos de ä18O indican que la interacción entre el fluido y la roca de caja fue baja. Los valores del ä18O del fluido en equilibrio con la dolomía a temperaturas de 140ºC indican que este fluido corresponde a una salmuera de cuenca. Por otro lado, los isótopos de carbono indican un aporte de carbono procedente de la diagénesis de la materia orgánica causada por un aumento de temperatura vinculada al soterramiento de la cuenca. Los resultados petrográficos y geoquímicos son consistentes con la dolomitización de un carbonato de origen marino que sufrió soterramiento. Resumen en inglés In Neuquen Basin, Argentina, a Zn-Pb mineralization was first reported by Garrido et al. (2000). The ore occurs in a carbonatic level located in Puesto Gregor, 50 km SSE from the city of Zapala at 39°11'34'' S, 69° 59'18'' W (Fig. 1). The hosting bed, a dolostone, belongs to a carbonatic-siliciclastic sequence of Lajas Formation, which is part of the Cuyo Group, Jurassic age. In the mineralization of Pb-Zn deposits associated to dolostones, the fluids that were involved (mas) in the ore precipitation process were also related to the dolomitization of the carbonatic rock (Warren, 2000). In this contribution, field, petrographic and geochemical studies were carried out in order to determine the temperature and composition of the dolimitizing fluids. The obtained results were then compared to those obtained from Carbon and Oxygen isotopes (Garrido et al., 2001) to discuss the dolimitization process. The mineralized bed, 0.90 m thick, outcrops for about 300 m along the strike (W-E) and 60 m in the dip direction (Fig. 2). This bed pinches out toward the east and toward the west it is no longer visible, it is cover by scours. Petrographic studies determined that the host rock is a dolostone with a breccia texture that becomes more siliciclastic towards the east grading thus to a fine sandstone with carbonatic cement. The hypogenic mineralization, mainly sphalerite, low quantities of galena, pyrite and marcasite is found within the small fractures. Some ghosts of fossils are still visible, but pervasive dolomitization characterizes the horizon. Two distinct dolomites are recognized by crosscutting relationships: a fine to medium grained crystalline dolomite, and a coarse grained crystalline dolomite related to the mineralization. The fomer shows dark-orange and white crystals which occur as patches or partially filled vugs. These crystals are 120-400 mm in size and exhibit subhedral to anhedral shapes (Fig. 3). According to Sibley and Gregg (1987), the texture is no planar -a- unimodal to polimodal. The latter dolomite presents well developed crystals (> 5 mm); they are translucent with pink color and pearl shine and have crystal faces that look like a pavement and is referred as "saddle" dolomite according to Radke and Mathis (1980). This "saddle" dolomite is found into dissolution cavities or as clusters of crystals located on the wall fractures; it is always associated to the mineralization. Chemical analysis of major, traces and rare earth elements are homogeneous throughout the bed. Mean values are 15% MgO, 29,66% CaO and 40,43 % CO2, with high MnO and Fe2O3 contents. The molar percentages of CaCO3 and MgCO3 indicate near stoichiometric ratio (52% and 48%) with a light excess of Ca (Table 1, Fig. 4). The trace elements Sr, Na, Fe and Mn are used to constrain dolomite evolution. Sr values varies from 79 to 159 ppm and Na from 74 to 225 ppm; Mn and Fe contents are higher than the values determined for carbonatic rocks (Turekian and Wedepohl, 1961). ÓREE and LREE contents are low, and the diagram normalized to chondrite shows a negative anomaly of Eu and a great negative anomaly of Ce. The 13C (VPDB) and 18O (VPDB) values vary from -2,9 to -9(0)/00 and from -2,6 to -4 0/00 respectively (Table 2). The 13C are incoherent with the data recorded for Jurassic marine carbonates (near 0 0/00) while 18O values can be correlated with carbonates of the same age (Veizer et al., 1999). Petrography and chemical analysis allow characterizing the depositional environment of the Zn- Pb mineralized dolostone. The xenotopic texture of the dolomite with no planar crystals, gives evidence that the temperatures of deposition should have been higher than 50-60°C (Gregg and Sibley, 1984). On the other hand, the chemical composition, near ideal dolomites (stoichiometric ratio), indicates slow crystallization at high temperature (Morrow, 1982). Morover, the destructive fabric and the homogeneous composition suggest a high temperature dolomitization (Machel, 2004). Trace element values, mainly Na and Sr, agree with burial dolomites, as well as the fluid inclusions reported for these samples by Cesaretti et al. (2002). The negative Ce anomaly indicates that these rocks were formed in a marine environment. Two different processes of carbonate precipitation can produce negative Ce anomaly (Möller, 1989; Bau and Möller, 1992): deposition from seawater or from hydrothermal solutions equilibrated with highly oxydized sediments. The latter is discarded because of the presence of framboidal pyrite and organic matter, which, along with the Eu negative anomaly indicates that the dolimitization were generated under euxinic conditions. This dolostone is in contact with anoxic mudstones (Los Molles Formation, Cuyo Group). Petrographic and geochemical criteria reflect that the dolomitization were caused by normal or modified sea water in a burial environment at temperatures above 140ºC. In burial or altered dolostones, the oxygen isotopes reflect temperature of precipitation and isotope composition of the dolomitizing fluids. The oxygen isotope values of this dolomitized bed are compatible with the isotope composition of carbonates precipitated from sea water at 25°C. The narrow range in the obtained values indicates that there was no influence of meteoric water during this process (Allan and Mathews, 1982). The homogeneous values of 18O isotope suggest that the physic-chemical conditions remained constant during dolomitization, what is in agreement with the textural and geochemical homogeneity found in the study samples. The 18O isotope values of a fluid equilibrated with carbonate at 140°C indicate that the fluid belongs to a basinal fluid. The 13C isotopes reflect an organic origin for the carbon. This carbon came from the diagenesis of organic matter caused by an increase in temperature during the burial of the basin (Garrido et al., 2001; Cesaretti et al., 2002). In contrast with other MVT deposits of the world, in Puesto Gregor, the dolomitization was slow process acting at high temperatures, what has been confirmed by the homogeneity of the fabric and the narrow range in the isotope and trace elements composition. These conditions were reached during burial of the basin where the rocks interact with the basin fluids associated to the ore minerals.

Scientific Electronic Library Online (Spanish)

42

Parameterizing the Effect of Dark Energy Perturbations on the Growth of Structures

Ballesteros, Guillermo; Riotto, Antonio

18 LaTex pages, 7 figures. | We present an analytical fit to the growth function of the dark matter perturbations when dark energy perturbations are present. The growth index γ depends upon the dark energy equation of state w, the speed of sound of the dark energy fluctuations, the dark matter abund...

DRIVER (Spanish)

44
45

Neutrino masses, leptogenesis, and dark matter in a hybrid seesaw model

Gu, P.H.; Hirsch, Martin; Sarkar, U.; Valle, José W. F.
2009-02-18

Digital.CSIC (Spain)

46

Neutrino mass, Dark Matter and Baryon Asymmetry via TeV-Scale Physics without Fine-Tuning

Aoki, Mayumi; Kanemura, Shinya; Seto, Osamu

PACS numbers: 14.60.Pq, 14.60.St, 14.80.Cp, 12.60.Fr.-- 4 pages including 3 figures. | We propose an extended version of the standard model, in which neutrino oscillation, dark matter, and baryon asymmetry of the Universe can be simultaneously explained by the TeV-scale physics without assuming unna...

DRIVER (Spanish)

48

Neutralino dark matter from heavy axino decay

Choi, Ki-Young; Kim, Jihn E.; Lee, Hyun Min; Seto, Osamu

Submitted on 3 Jan 2008 (v1), last revised 19 Jun 2008 (this version, v2).-- 7 pages, 4 figures; references added, published version in Phys. Rev. D.-- PACS numbers: 95.35.+d, 98.80.Cq. | We consider cosmological consequences of a heavy axino, decaying to the neutralino in R-parity conserving models...

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49

Neutralino dark matter from heavy axino decay

Choi, Ki-Young; Kim, Jihn E.; Lee, Hyun Min; Seto, Osamu
2008-06-19

Digital.CSIC (Spain)

50

Natural dark matter in SUSY GUTs with non-universal gaugino masses

King, Stephen F.; Roberts, Jonathan P.; Roy, Durga Prasad

20 pages, 3 figures.-- ISI Article Identifier: 000250759700005.-- ArXiv pre-print available at: http://arxiv.org/abs/0705.4219 | We consider neutralino dark matter within the framework of SUSY GUTs with non-universal gaugino masses. In particular we focus on the case of SU(5) with a SUSY breaking F-...

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51

Natural dark matter in SUSY GUTs with non-universal gaugino masses

King, Stephen F.; Roberts, Jonathan P.; Roy, Durga Prasad
2007-10-31

Digital.CSIC (Spain)

52

Modulus-dominated SUSY-breaking soft terms in F-theory and their test at LHC

Aparicio, Luis; Cerdeño, David G.; Ibáñez, Luis E.
2008-06-26

Digital.CSIC (Spain)

53

Model independent constraints on mass-varying neutrino scenarios

Pastor, Sergio; Franca, Urbano; Lattanzi, M.; Lesgourgues, J.
2009-10-07

Digital.CSIC (Spain)

54

Mineralización del estiércol bovino y su impacto en la calidad del suelo y la producción de tomate (Lycopersicum sculentum Mill) bajo riego sub-superficial: (con 3 figuras y 6 tablas)

Salazar-Sosa, Enrique; Vázquez-Vázquez, Cirilo; Leos-Rodríguez, Juan Antonio; Fortis-Hernández, Manuel; Montemayor-Trejo, José Alfredo; Figueroa-Viramontes, Rafael; López-Martínez, José Dimas
2004-12-01

Resumen en español El estudio se realizó en el Campo Agrícola Experimental de la Facultad de Agricultura y Zootecnia de la Universidad Juárez del Estado de Durango (CAE-FAZ-UJED) en 1998 y 1999.Se evaluó el impacto dedos factores sobre rendimiento y características físicas y químicas del suelo. Los factores fueron: factor A acolchado; con y sin plástico negro y Factor B estiércol de bovino con los niveles siguientes: testigo (cero aplicación), 40 t ha-1, 80 t ha-1, 120 t ha-1 y 16 (mas) 0 t ha-1, fertilizante químico (100-60-00). El genotipo fue el híbrido Saladette Río Grande. El sistema de riego fue de gravedad en 1998 y goteo (cintilla) en 1999 ya que está demostrado que con el riego por gravedad las pérdidas de conducción, evaporación e infiltración rebasan hasta en más del 40% al de goteo y para esta región este es un factor determinante en la producción agrícola dada la baja disponibilidad de agua y la alta evaporación, la cual rebasa hasta en un 11% a la precipitación pluvial anual. Los tratamientos se establecieron en un diseño de bloques al azar con arreglo en franjas con tres repeticiones. Hubo un incremento en la materia orgánica y nitratos en los tratamientos donde se aplicó estiércol con acolchado plástico, influyendo esto en el rendimiento del cultivo. Los resultados para 1998 indican que los rendimientos totales de tomate en kg ha-1 no reflejan claramente la bondad del estiércol ya que el testigo es estadísticamente igual, así como también al tratamiento donde se aplicó fertilizante químico, debido probablemente a que en el primer año el suelo, por su textura arcillosa, presentaba nutrimentos suficientes para satisfacer las necesidades del cultivo, esto es muy común cuando se trabaja con estiércoles o fertilizantes químicos sobre los suelos arcillosos. Para el año 1999 los resultados, con respecto al rendimiento total de tomate, también presentaron significancia estadística al (P Resumen en inglés The study was carried out at the experimental field of the Faculty of Agriculture y Zootecnia, Universidad Juarez in the State of Durango, Mexico.The following factors were evaluated on soil physical and chemical parameters and yield: factor A; with and without plastic mulch and factor B; Manure dosage, whose levels were: control (no application); 40 t ha-1, 80 t ha-1and 160 t ha-1 respectively. As additional level, one chemical fertilizer was used (100-60-00 kg ha-1). Th (mas) e crop used was tomato hybrid type saladette Rio Grande. The irrigation systems used were gravity during 1998 and drip irrigation in 1999. The treatments was settled down in a random experimental block design with three replications. The experimental data indicated that organic matter and nitrates showed an increment in their content with significance due to the manure applications with dark plastic mulch. For 1998 treatments 1 to 7 (control, chemical fertilizer whithout black plastic mulch, chemical fertilizer with black plastic mulch, 120 t ha-1 without black plastic mulch, control without black plastic mulch, 40 t ha-1 without black plastic mulch and 80 t ha-1without black plastic mulch) were higher in a range of 46.9 to 58.8 t ha-1 to those obtained in treatments, 8-12 respectively. In 1999 yield showed statistical significance, in the yield for the control treatment was lower compared to the other treatments. In addition, the chemical fertilizer level had similar yield production than the manure (120 t ha-1) with plastic mulch (117.42 t ha-1).

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Microbial oceanography of the dark ocean's pelagic realm

Arístegui, Javier; Gasol, Josep M.; Duarte, Carlos M.; Herndl, Gerhard J.
2009-04-16

Digital.CSIC (Spain)

56

MSSM forecast for the LHC

Ruiz de Austri, Roberto; Casas, Alberto; Cabrera, María Eugenia
2010-05-01

Digital.CSIC (Spain)

57

MINERALOGÍA Y GENESIS DE ALGUNOS SUELOS DE CENIZAS VOLCÁNICAS DE CHILOÉ CONTINENTAL, CHILE/ Mineralogy and origin of some volcanic ash soils of continental Chiloé, Chile

Besoain M, Eduardo; Peralta P, Mario; Massaro M, Silvana
2000-04-01

Resumen en español Se estudiaron cuatro Andisoles provenientes de los volcanes Hornopirén y Hualaihué o volcán Apagado, situados en Chiloé Continental, provincia de Palena, X Región (41º 53’S). Los suelos están localizados en las faldas de los volcanes, en un relieve abrupto cubierto con una densa foresta pluvial, muy húmeda, de 4.000 a 5.000 mm de precipitación anual, y temperatura media anual de 10ºC. Se describió la morfología de los suelos y se determinaron sus propiedades (mas) químicas, físicas y mineralógicas. Los pediones son profundos y sus variaciones texturales sugieren la participación de varios episodios eruptivos. Todos los suelos se caracterizan por tener un horizonte A grueso, con elevado contenido de materia orgánica (12-25% C-orgánico), valores elevados a moderados de retención de agua a 1500 kPa, altos valores de retención de fósforo (>90%), con la excepción de los horizontes sub-superficiales del suelo Pululil. La CIC es moderada a alta y la saturación de bases es muy baja. El contenido de vidrios volcánicos es muy alto (59-88%) y tiende a aumentar con la profundidad del perfil; la mayoría de los vidrios tienen burbujas. Los coloides de los suelos son alofánicos, pero en la superficie prevalecen los complejos Al, Fe-húmicos. Sílice opalina también se encuentra en el horizonte A de todos los pediones. Los suelos satisfacen las propiedades ándicas y pertenecen al Orden de los Andisoles, suborden de los Udands Resumen en inglés Four andisols from volcanoes Hornopirén and Hualaihué or Apagado, located in continental Chiloé, X Region (41º 53’S) were studied. The soils are located on the slopes of the volcanoes, on a very steep elevation covered with dense rain forest. The local climate averages 4,000 -- 5,000 mm annual rainfall and a mean annual temperature of 10ºC. The soils were described morphologically and their chemical, physical and mineralogical properties were determined. The horizon (mas) s are deep and their textural variation suggests various eruptions. All the soils were characterized by a thick dark A horizon with high organic matter content (12-25% organic carbon); high to moderate water retention at 1,500 kPa; high phosphate retention values (>90%), with the exception of the subsurface horizon of Pululil soil. The content of volcanic glass is very high (59-88%) and tends to increase with the depth of the profile; most of the glass contains bubbles. Soil colloids are allophanic, but at the surface Al, Fe-humic complexes predominate. Opaline silica is also found in A-horizons of all pedons. The soils satisfy the andic properties and belong to the Order of Andisols and Sub-Order of Udands

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Light stimulates growth of proteorhodopsin-containing marine Flavobacteria

Gómez-Consarnau, Laura; González, José M.; Coll-Lladó, Montserrat; Gourdon, Pontus; Pascher, Torbjörn; Neutze, Richard; Pedrós-Alió, Carlos; Pinhassi, Jarone
2007-01-11

Digital.CSIC (Spain)

59

Just so Higgs boson

Bazzocchi, Federica; Fabbrichesi, M.; Ullio, P.

8 pages, 4 figures.-- PACS nrs.: 11.30.Qc; 12.60.Fr; 14.80.Cp; 95.35.+d.-- ISI Article Identifier: 000245333000072.-- ArXiv pre-print available at: http://arxiv.org/abs/hep-ph/0612280 | We discuss a minimal extension to the standard model in which there are two Higgs bosons and, in addition to the u...

DRIVER (Spanish)

60

Just so Higgs boson

Bazzocchi, Federica; Fabbrichesi, M.; Ullio, P.
2007-03-23

Digital.CSIC (Spain)

62

Inflationary axion cosmology beyond our horizon

Kaplan, David B.; Nelson, Ann E.
2010-01-01

Digital.CSIC (Spain)

63

Identification of dark matter particles with LHC and direct detection data

Ruiz de Austri, Roberto; Trotta, R.; Fornasa, M.; Cerdeño, David G.; Bertone, G.
2010-09-10

Digital.CSIC (Spain)

64

High dissolved extracellular enzymatic activity in the deep central Atlantic Ocean

Baltar, Federico; Arístegui, Javier; Gasol, Josep M.; Sintes, Eva; van Aken, Hendrik M.; Herndl, Gerhard J.
2010-02-11

Digital.CSIC (Spain)

65

Higgs in space!

Taoso, Marco; Jackson, C. B.; Servant, Géraldine; Shaughnessy, Gabe; Tait, Tim M. P.
2010-04-06

Digital.CSIC (Spain)

67

Gravitino dark matter in hybrid gauge-gravity models

Cerdeño, David G.; Mambrini, Yann; Romagnoni, A.
2009-11-01

Digital.CSIC (Spain)

68

Gamma-ray detection from gravitino dark matter decay in the $\mu\nu$SSM

Choi, Ki-Young; López-Fogliani, Daniel E.; Muñoz, Carlos; Ruiz de Austri, Roberto
2010-01-01

Digital.CSIC (Spain)

70

Future CMB cosmological constraints in a dark coupled universe

Mena, Olga; Melchiorri, A.; López Honorez, L.; Martinelli, M.
2010-05-15

Digital.CSIC (Spain)

71

Flavor physics at large tan beta with a binolike lightest supersymmetric particle

Isidori, Gino; Mescia, Federico; Paradisi, Paride; Temes, David

12 pages, 7 figures.-- PACS nrs.: 12.60.Jv; 13.25.Hw; 13.35.-r; 95.35.+d.-- ISI Article Identifier: 000247625300053.-- ArXiv pre-print available at: http://arxiv.org/abs/hep-ph/0703035 | The minimal supersymmetric extension of the standard model with large tanβ and heavy squarks (M-q >~ 1 TeV) is a ...

DRIVER (Spanish)

72

Flavor physics at large tan beta with a binolike lightest supersymmetric particle

Isidori, Gino; Mescia, Federico; Paradisi, Paride; Temes, David
2007-06-28

Digital.CSIC (Spain)

73

Experimental constraints on a dark matter origin for the DAMA annual modulation effect

Aalseth, C.E.; Barbeau, P.S.; Cerdeño, David G.; Colaresi, J.; Collar, Juan I.; Lurgio, P. de; Drake, G.

4 pages.-- PACS numbers: 85.30.-z, 95.35.+d, 95.55.Vj, 14.80.Mz.-- Submitted on 5 Jul 2008 (v1), last revised 31 Jul 2008 (this version, v4): v4 introduces recent results from arXiv:0807.3279 and arXiv:0807.2926. Sensitivity to pseudoscalars is revised in light of the first. Discussion on the subjec...

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Experimental constraints on a dark matter origin for the DAMA annual modulation effect

Aalseth, C.E.; Barbeau, P.S.; Cerdeño, David G.; Colaresi, J.; Collar, Juan I.; Lurgio, P. de; Drake, G.; Fast, J.E.; Greenberg, C.H.; Hossbach, T.W.; Kephart, J.D.; Marino, M.G.; Miley, H.S.; Orrell, J.L.; Reyna, D.; Robertson, R.G.H.; Talaga, R.; Tench, O.; Van Wechel, T.D.; Wilkerson, J.F.; Yocum, K.M.
2008-07-31

Digital.CSIC (Spain)

75

Evidence of prokaryotic metabolism on suspended particulate organic matter in the dark waters of the subtropical North Atlantic

Baltar, Federico; Arístegui, Javier; Gasol, Josep M.; Sintes, Eva; Herndl, Gerhard J.
2009-01-01

Digital.CSIC (Spain)

76

Estratigrafía del Grupo Mina Verdun, Proterozoico de Minas, Uruguay/ Stratigraphy of the Mina Verdún Group, Proterozoic of Minas, Uruguay

Poiré, Daniel G.; González, Pablo D.; Canalicchio, José M.; García Repetto, Flavio
2005-12-01

Resumen en español El objetivo del presente trabajo es el de presentar un cuadro estratigráfico para las sedimentitas del área del Cerro Verdún, Minas, Uruguay. Asimismo presentar algunas consideraciones sobre sus características sedimentológicas y sus estromatolitos, a fin de discutir sus condiciones paleoambientales. En el mismo sentido, se realizan inferencias sobre la edad abarcada por estas rocas y sus potenciales correlaciones regionales. Esta sucesión ha permanecido indefinida (mas) en general, mientras que sus calizas fueron alternativamente asignadas a diversas unidades litoestratigráficas. En esta contribución se incluye al conjunto en el Grupo Mina Verdún, el cual está conformado de base a techo por: i) Formación Don Mario (40 m, base no expuesta, lutitas negras), ii) Formación La Toma (15 m, margas verdes oscuras a negras), iii) Formación El Calabozo (170 m, calizas grises, masivas, laminadas y estromatolíticas) y iv) Formación Gibraltar (60 m, techo no expuesto, dolomías en tonalidades pálidas amarillentas, verdes y rosas hasta gris oscuras más calizas rosas y pelitas y margas negras). Conglomerados polimícticos de la Formación Las Palmas cubren a esta unidad mediante una discordancia angular. En contraposición, las cuarcitas del Cerro Verdún se apoyan sobre el Grupo Mina Verdún por contacto tectónico. Las pelitas negras de la Formación Don Mario se habrían depositado en un ambiente reductor de aguas calmas. Se identifica para las mismas, de manera preliminar, un aporte desde una corteza continental superior diferenciada que sufrió una importante meteorización y retrabajo. Las margas de la Formación La Toma reflejan un cambio en la sedimentación, con un pasaje hacia un ambiente de rampa carbonática. Niveles con estromatolitos aparecen en las calizas de la Formación El Calabozo, constituidos esencialmente por columnas de laminación cónica asignables a Conophyton fm. y muy escasos estromatolitos columnares dendroides, mal preservados. Conophyton es considerado como un estromatolito submareal de aguas relativamente profundas. Esto último, sumado a la baja diversidad, sugiere un ambiente marino submareal externo para esta unidad. Correlaciones entre afloramientos locales, definirían una evolución desde una rampa carbonática hasta una plataforma, en las inmediaciones del talud de la misma. La edad de esta unidad aún no se conoce con precisión. Sin embargo, interpretaciones geológicas regionales, sobre la base de los estromatolitos presentes y de datos geoquímicos, sugieren un tiempo de depositación post-arqueano a pre-ediacareano. Resumen en inglés The aim of this contribution is to introduce the stratigraphic framework of the Mina Verdún Quarry, located in the eastern side of Verdún Hill, Minas, Uruguay (Fig. 1), and to characterise their sedimentary units. The paleoenvironments involved are outlined as well as the sedimentological significance of the very well developed stromatolites. The stratigraphic position and composition of this sedimentary succession used to be uncertain and the limestone from the Mina Ve (mas) rdún Quarry was alternatively considered part of diverse litostratigraphic units (Mac Millan, 1933; Caorsi and Goñi, 1958; Bossi et al., 1965; Midot, 1984; Preciozzi et al., 1985; Bossi and Navarro, 2000; Sánchez Betucci, 1998; Sánchez Betucci et al., 2001). From the base to the top (Fig. 2), the sedimentary succession consists of the Mina Verdún Group, Las Palmas Formation and the quartzites of the Verdún Hill (Fig. 3). Mina Verdún Group (Poiré et al., 2003b) is conformed by: Don Mario Formation (Poiré et al., 2003b): 40 m thick, base not exposed; massive and laminated, black shales (Fig 4a), which are rich in organic matter (Fig. 5a). XRD analysis shows manly quartz, with scarce calcite, clay (illite, chlorite, and IS and CS interlayer) and feldspars (Fig. 6). Applying the Bhatia and Crook (1986), Taylor and McLennan (1985) and McLennan et al. (1990, 1993) plots (Fig. 7) their geochemistry suggests a high degree of weathering and reworking in the source area compose of a differentiated upper continental crust. La Toma Formation (Poiré et al., 2003b): 15 m thick; fine-grained, dark green marls (Fig. 4b and c), bearing up to 45 % of silica and 35 % of CaCO3. Petrographically they show micritic crystals of calcite and dolomite, quartz and feldspars (Fig. 5b); lamination is interrupted by stilolytes. Clay minerals are composed mainly by illite and scarce chlorite (Fig. 6). El Calabozo Formation (Poiré et al., 2003b): 170 m thick; grey massive, laminated, and stromatolite limestones (Fig. 4d), bearing up to 93 % of CaCO3 with some collapse breccias as resulting of probably karstic phenomena. In thin section they show homogeneous mosaic of micrite and subsparite calcite (Fig. 5 c and d) with stilolites and corrugated stromatolite lamination. Very abundant calcite with rare quartz, feldspars and illite have been recorded by XRD (Fig. 6). This sedimentary sequence is affected by diagenetic features and a fragile deformation (cleavage foliation, shear zones) which are slightly hiding the stromatolite morphologies (Fig. 8), but the main features of the stromatolites from El Calabozo Formation are still well preserved. Columnar stromatolites assignable to Conophyton fm. are the most abundant group of these organic sedimentary structures. This Conophyton fm. consists of unbranching subcylindrical columnar stromatolites with strikingly conical internal laminae whose apexes define a distinctive axial zone (Figs. 10a, b, c) and their horizontal section display a conspicuously and regularly concentric structure (Figs. 10c, d, f). The internal laminae are commonly continuous from one column to another, in which case vertical sections show upward laminae apexing. Their profile is angulate to geniculate and their plant outline could be round circular to oblong, in which case the axes are strongly orientated. The attitude of the columns is usually straight but sometimes they adopt a recumbent and sinuous posture. The column height is up to 70 cm and the column width is 5 to 20 cm. However, scarce but preserved dendroid branching style stromatolites have been recorded on the field, as well as small, rounded plant outline columnar stromatolites have been observed in cores, which could represent digitate branching stromatolites. Five kilometres to the south, this stromatolitic limestone facies change to deformed laminate limestones (Figs. 4e, f). Furthermore, 40 km to south, the El Calabozo Formation bearing Conophyton stromatolites has been reported by Gaucher et al. (2004a). Gibraltar Formation (Poiré et al., 2003b): 60 m, top not exposed; black marls and shales (Figs, 10a, b, c), pink limestones and dolomite limestones, and light yellow, green, reddish, black and grey dolomites (Fig. 10d, e). The unconformity between the El Calabozo and Gibraltar formations is very irregular, which is interpreted as a karstic palaeorelief. A 4 m thick diagenetic breccia is often in the base of the unit. The Mina Verdún Group is overlaid by red polymictic conglomerates and sandstones (Fig. 10f) of Las Palmas Formation (Poiré et al., 2003b) and is intruded by a subvolcanic longitudinal (E-W) dike swarm. This shows a K-Ar whole rock datum of 485,2 ± 12,5 Ma considered as a minimum cooling (Gonzalez et al., 2004). The quarzites from the Verdún Hill are overlying these units by a tectonic contact. They have been assigned to the Cerro Espuelitas Formation by Gaucher (2000), which are Ediacarean in age. Sedimentological and stratigraphic implications The black shales and claystones of the Don Mario Formation are interpreted as fine deposits in a low energy environment with euxinic conditions, which becomes calcareous to form a carbonatic ramp (La Toma Formation). The latter shows and evolution to a carbonatic algae platform very rich in stromatolites. From a sedimentological point of view, the group Conophyton has been assigned as a deep subtidal stromatolite by Poiré (1987, 2002) based on Precambrian stromatolite cycles from Villa Mónica Formation, Buenos Aires Province, Argentina, and Logan et al. (1964) and Donaldson (1976) ideas. In this sense, the low biodiversity, Conophyton abundance and the plant view axes orientation allow to suggest a subtidal marine environment for the El Calabozo Formation, with tidal currents influence (Fig. 11). The strong dolomitization of the Gibraltar Formation and their poor exposure do not allow doing detailed interpretation about paleoenvironments. The age of the Mina Verdún Group is Precambrian but there are not major precisions about that. Unfortunately, the group Conophyton has a wide range during the Precambrian, from Early Proterozoic to Ediacarean, being impossible to define the age of these limestones. More detailed future studies about microstructure of this Conophyton could be useful to distinguish the taxonomy and to determinate its possible age. Pre-Ediacarean stromatolites have also been described 30 km to the north by Sprechmann et al. (1994) and Gaucher et al. (1996) in the Villalba Formation of the Basal Group (Gaucher y Sprechmann, 1995), but their morphologies are completely different. They have recorded stratiform, nodular-stratiform (LLH-C, LLHV) and columnar (SH-V) stromatolites associated with stromatolitic breccias, which were interpreted as intertidal to supratidal deposits. It could represent shallower stromatolite assemblages than the stromatolites from the Mina Verdún. Unfortunately, there are no radiometric data to prove this idea. Very well developed Conophyton ?ressotti and Conophyton fm. have been also recorded in the dolomites of the Villa Mónica Formation (Poiré, 1993) companied by Colonella fm., Cryptozoon fm., Gongylina fm., Gymnosolem fm., Inzeria fm., Jacutophyton fm., Jurusonia nisvensis, Katavia fm., Kotuikania fm., Kussiella fm., Minjaria fm., Parmites fm., Parmites Cf. cocrescens and Stratifera fm. (Poiré, 1989 y 1993), which radiometric age for diagenesis is 795 My (Cingolani y Bonhomme, 1988). This sequence could be correlated with El Calabozo Formation but it shows a poor biodiversity. The Mina Verdún Group is considered as a new lithostratigraphic unit in the Uruguayan stratigraphic framework, which is probably located somewhere between the Basal and Arroyo del Soldado groups.

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Effect of low mass dark matter particles on the Sun

Taoso, Marco; Meynet, G.; Bertone, G.; Iocco, F.; Eggenberger, P.
2010-10-08

Digital.CSIC (Spain)

79

Determining the WIMP mass using the complementarity between direct and indirect searches and the ILC

Bernal, N.; Goudelis, A.; Mambrini, Yann; Muñoz, Carlos

26 pages, 14 figures. | We study the possibility of identifying dark matter properties from XENON-like 100 kg experiments and the GLAST satellite mission. We show that whereas direct detection experiments will probe efficiently light WIMPs, given a positive detection (at the 10% level for $m_{\chi} ...

DRIVER (Spanish)

81

Detection of circumstellar CH2CHCN, CH2CN, CH3CCH and H2CS

Agúndez, Marcelino; Fonfría, José Pablo; Cernicharo, José; Pardo Carrión, Juan Ramón; Guélin, Michel
2007-12-06

Digital.CSIC (Spain)

82

Decaying warm dark matter and neutrino masses

Lattanzi, Massimiliano; Valle, José W. F.

4 pages, 3 figures.-- PACS nrs.: 95.35.+d; 14.60.Pq; 14.80.Mz; 98.70.Vc.-- ISI Article Identifier: 000249668000018.-- ArXiv pre-print available at: http://arxiv.org/abs/0705.2406 | Neutrino masses may arise from spontaneous breaking of ungauged lepton number. Because of quantum gravity effects the a...

DRIVER (Spanish)

83

Decaying warm dark matter and neutrino masses

Lattanzi, Massimiliano; Valle, José W. F.
2007-09-20

Digital.CSIC (Spain)

84

Dark coupling and gauge invariance

Gavela, Mª Belén; López Honorez, L.; Mena, Olga; Rigolin, S.
2010-11-01

Digital.CSIC (Spain)

85

Dark coupling

Gavela, Mª Belén; Hernández, D.; López Honorez, L.; Mena, Olga; Rigolin, S.
2009-07-01

Digital.CSIC (Spain)

86

Dark Matter decay and annihilation in the Local Universe: CLUES from Fermi

Cuesta, A. J.; Jeltema, T. E.; Zandanel, F.; Profumo, S.; Prada, F.; Yepes, G.; Klypin, A.; Hoffman, Y.; Gottlöber, S.; Primack, J.; Sánchez-Conde, M.; Pfrommer, C.
2011-01-01

Digital.CSIC (Spain)

87

Coupled dark matter-dark energy in light of near universe observations

López Honorez, L.; Reid, Beth A.; Mena, Olga; Verde, Licia; Jiménez, Raúl
2010-09-01

Digital.CSIC (Spain)

88

Cosmological parameter constraints from SDSS luminous red galaxies: a new treatment of large-scale clustering

Sánchez, Ariel G.; Crocce, Martín; Cabré, Anna; Baugh, Carlton M.; Gaztañaga, Enrique
2009-10-01

Digital.CSIC (Spain)

90

Confronting dark energy models with astrophysical data: Non-equilibrium vs. conventional cosmologies

Ellis, John; Mavromatos, Nikolaos E.; Mitsou, Vasiliki A.; Nanopoulos, Dimitri V.
2007-03-01

Digital.CSIC (Spain)

92

Conceptual Study on Maillardized Dietary Fiber in Coffee

Silvan, Jose Manuel; Morales, Francisco J.; Saura-Calixto, Fulgencio
2011-02-26

Digital.CSIC (Spain)

93

Comparación del efecto de dos especies forrajeras sobre el pH de la rizosfera y la disolución de rocas fosfóricas de diferente reactividad

Pérez, M. J.; Smyth, T. Jot
2005-04-01

Resumen en español La acidez y bajas concentraciones de Ca y P en solución son los principales factores del suelo que controlan la disolución de las rocas fosfóricas (RFs). Las raíces de las plantas pueden afectar la disolución de las RFs, mediante la extrusión de H+ u OH- hacia la rizosfera. El objetivo de este estudio fue comparar el efecto de dos especies forrajeras: Brachiaria decumbens (gramínea) y Stylosanthes guianensis (leguminosa) sobre la acidificación de la rizosfera y la (mas) disolución de RFs de diferente reactividad, en un Ultisol deficiente en P y Ca. El experimento se realizó en cámara de crecimiento controlada a 30/26ºC día/noche, 12/12 horas día/noche y 30% de humedad relativa y consistió en una combinación factorial de las dos especies forrajeras, dos niveles de pH del suelo (suelo (pH 4,9 original y encalado hasta pH 5,8 con MgCO3) y cinco tratamientos de P dispuestos en un diseño experimental de parcelas divididas. Los tratamientos de P consistieron en aplicar 50 mg kg-1 de P soluble en citrato de amonio, provenientes de las RFs Monte Fresco (RFMF), Riecito (RFR) y Carolina del Norte (RFCN), fosfato monocalcico grado reactivo [Ca(H2PO4) 2] como referencia de una fuente de P soluble (SFT) y un testigo sin P. Se utilizaron potes especiales diseñados para aislar suelo de la rizosfera y no-rizosfera. El pH de la rizosfera disminuyó en los tratamientos con Stylosanthes, pero aumentó en aquellos con Brachiaria. La acidificación de la rizosfera y mayor disolución de las RFs con el Stylosanthes estuvo asociada con una mayor área superficial de raíces, mayor absorción de Ca y dependencia de esta especie en la fijación biológica de N2, lo cual pudo resultar en un exceso de cationes en la planta y el eflujo de H+ a través de las raíces hacia la rizosfera. La disolución de las RFs fue influenciada por la interacción de la especie de planta y la composición mineralógica de las RFs. La RFMF presenta menor contenido de apatita y mayor contenido de CaCO3 que la RFR y RFCN, lo cual correspondió con los altos valores de pH (>7,0) y DCa en suelo, y bajos valores de materia seca aérea con esta RF. En los tratamientos con la RFMF, la acidificación de la rizosfera por parte de la leguminosa no fue suficiente para promover la disolución de esta RF. La RFR se comporta mejor que la RFCN, a medida que aumenta la acidez del suelo. Resumen en inglés Abstract Low soil pH and low concentrations of Ca and P in solution are the main soil factors controlling dissolution of phosphate rocks (PRs). Plant roots may affect PR solubility by extrusion of H+ or OH- in the rhizosphere. The objective of this study was to compare the effects of a grass (Brachiaria decumbens) and a legume (Stylosanthes guianensis) forage species on rhizosphere acidification and solubilization of three phosphate rocks (PRs) of different reactivities i (mas) n a P- and Ca-deficient Ultisol. The experiment was conducted in a growth chamber at 30/26 ºC day/night temperature, 12/12 hours light/dark period and 30% relative humidity. It consisted on a factorial combination of two forage species, two soil pH levels (original pH 4.9 and limed to pH 5.8 with MgCO3) and five P treatments, arranged in a split plot design with three replications. Phosphorus treatments consisted on 50 mg P kg-1 of soluble P in neutral ammonium citrate, from Monte Fresco PR (MFPR), Riecito PR (RPR), North Carolina PR (NCPR), monocalcium phosphate reactive grade [Ca (H2PO4) 2] as a P soluble source (TSP), and a control without P. Pots were designed to isolate rhizosphere and non-rhizosphere soil. Rhizosphere soil pH decreased under Stylosanthes but increased under Brachiaria. Rhizosphere acidification and larger PR dissolution by Stylosanthes was associated with a larger root surface area, greater Ca uptake, and dependence on N2 fixation by the legume, which may result in an excess of cathions in plant and induce H+ extrusion from roots into the rhizosphere. Solubilization of RRs was influenced by the interaction of forage species and mineral composition of the PR. The MFPR has less apatite and higher content of CaCO3 than RPR and NCPR, which corresponded to the high soil pH values (pH >7.0) and exchangeable Ca, and low dry matter production with MFPR treatments. Acidification of the rhizosphere by Stylosanthes is not sufficient to promote dissolution of the MFPR. Riecito PR performs better than NCPR as soil acidity increases.

Scientific Electronic Library Online (Spanish)

94

Caracterización de los suelos bajo bosque de Austrocedrus chilensis a través de un gradiente climático y topográfico en Chubut, Argentina/ Soil characterization of Austrocedrus chilensis forests along a climatic and topographic gradient in Chubut province, Argentina

LA MANNA, LUDMILA
2005-08-01

Resumen en español Los bosques de Austrocedrus chilensis (Ciprés de la cordillera) se desarrollan en la región andino-patagónica, abarcando en Argentina un área de alta heterogeneidad ambiental. En este trabajo se caracterizaron los suelos donde se desarrollan bosques de A. chilensis, a través de un gradiente topográfico y de precipitación en la provincia de Chubut. Se seleccionaron 8 sitios de muestreo correspondientes a bosques puros y compactos de A. chilensis, abarcando un rango (mas) latitudinal aproximado desde 42°0’ hasta 43°14’ L.S. En cada sitio de muestreo se caracterizaron las propiedades morfológicas, físicas y químicas del suelo. Los bosques de A. chilensis se desarrollaron sobre suelos de diferentes materiales parentales: depósitos glacifluviales, aluviales, andesita, ceniza y pumita. Los suelos volcánicos presentaron discontinuidades litológicas, ya sea glacifluvial o material rocoso. En general, los suelos presentaron horizontes superficiales oscuros, ricos en materia orgánica (8,5 a 14,6%), con bajas densidades aparentes (0,57 a 0,97 g/cm³), y pH en agua neutro o ligeramente ácido todo a lo largo del perfil. Sin embargo, los diferentes materiales parentales determinaron grandes variaciones en textura (arcillosa a arenosa), contenido de fragmentos gruesos (0 a 50%), profundidad de suelo (35 a 140 cm), grado de alofanización (nulo a alto), contenido de humedad equivalente, etc. Los resultados evidenciaron la capacidad de A. chilensis para desarrollarse en suelos muy disímiles, desde suelos someros, arcillosos y con características vérticas, hasta suelos volcánicos profundos Resumen en inglés Austrocedrus chilensis forests (Cordilleran cypress) develop in the Patagonian Andes and its piedmont, covering an area of high environmental heterogeneity. In this work the soils where A. chilensis stands develop in Chubut province were characterized along a precipitation and topographic gradient. Eight sampling sites with pure and dense A. chilensis forests were selected, covering a latitudinal range from 42°0’ up to 43°14’ L.S. In each sampling site morphological, (mas) physical and chemical soil properties were characterized. A. chilensis forest developed in a wide range of soils with different parent materials: glacifluvial and alluvial deposits, andesite, volcanic ash, and pumice. Volcanic soils presented lithological discontinuities, either glacifluvial or rocky substratum. Generally, soils presented dark superficial horizons, rich in organic matter (8.5 to 14.6%) and with low bulk densities (0.57 to 0.97 g/cm³), and slightly acid to neutral pH in water along the profile. However, different parent materials determined great variations in texture (clayey to sandy), rock fragments (0 to 50%), effective soil depth (35 to 140 cm), allophanization degree (null to high), water retention, etc. Results showed A. chilensis capacity to inhabit different soils, from clayey, shallow and vertic soils to volcanic and deep ones

Scientific Electronic Library Online (Spanish)

95

Calculable inverse-seesaw neutrino masses in supersymmetry

Bazzocchi, Federica; Cerdeño, David G.; Muñoz, Carlos; Valle, José W. F.
2010-01-01

Digital.CSIC (Spain)

96

Black holes and galactic density cusps III from black hole to bulge

Le Delliou, Morgan; Henriksen, Richard N.; Macmillan, Joseph D.
2010-01-01

Digital.CSIC (Spain)

97

Black holes and galactic density cusps II spherically symmetric anisotropic cusps

Le Delliou, Morgan; Henriksen, Richard N.; Macmillan, Joseph D.
2010-01-01

Digital.CSIC (Spain)

98

Black holes and galactic density cusps I radial orbit cusps and bulges

Le Delliou, Morgan; Henriksen, Richard N.; Macmillan, Joseph D.
2010-01-01

Digital.CSIC (Spain)

100

A(4)-based neutrino masses with Majoron decaying dark matter

Valle, José W. F.; Tortola, M. A.; Romao, J.C.; Joshipura, Anjan S.; Joaquim, F. R.; Esteves, J.N.
2010-10-12

Digital.CSIC (Spain)

101

A phenomenological model of galaxy clusters

Ascasibar, Yago; Diego, José María

7 pages, 4 figures. Submitted to MNRAS. | We present a simple model to describe the dark matter density, the gas density, and the gas temperature profiles of galaxy clusters. Analytical expressions for these quantities are given in terms of only five free parameters with a clear physical meaning: th...

DRIVER (Spanish)

102

A phenomenological model of galaxy clusters

Ascasibar, Yago; Diego, José María
2007-06-18

Digital.CSIC (Spain)

103