Zobrazeno 1 - 10
of 22
pro vyhledávání: '"Beca, L."'
Publikováno v:
Phys.Rev.D77:101302,2008
We provide a generic but physically clear discussion of the clustering properties of dark energy models. We explicitly show that in quintessence-type models the dark energy fluctuations, on scales smaller than the Hubble radius, are of the order of t
Externí odkaz:
http://arxiv.org/abs/0802.0174
Publikováno v:
Phys. Rev. D77:063515,2008
We revisit the paradigm of unified dark energy discussing in detail the averaging problem in this type of scenarios, highlighting the need for a full non-linear treatment. We also address the question of if and how models with one or several dark flu
Externí odkaz:
http://arxiv.org/abs/0711.4288
Autor:
Beca, L. M. G., Avelino, P. P.
Publikováno v:
Mon.Not.Roy.Astron.Soc.376:1169-1172,2007
In this paper we show that a \emph{one-to-one} correspondence exists between any dark energy model and an equivalent (from a cosmological point of view, in the absence of perturbations) quartessence model in which dark matter and dark energy are desc
Externí odkaz:
http://arxiv.org/abs/astro-ph/0507075
Publikováno v:
JCAP 0309:002,2003
We explicitly demonstrate that, contrary to recent claims, the dynamics of a generalized Chaplygin gas model with an equation of state $p=-C$ (where $C$ is a positive constant) is equivalent to that of a standard $\Lambda$CDM model to first order in
Externí odkaz:
http://arxiv.org/abs/astro-ph/0307427
Publikováno v:
Phys.Rev.D69:041301,2004
We discuss the onset of the non-linear regime in the context of unified dark matter models involving a generalised Chaplygin gas. We show that the transition from dark matter-like to dark energy-like behaviour will never be smooth. In some regions of
Externí odkaz:
http://arxiv.org/abs/astro-ph/0306493
Publikováno v:
Phys.Rev. D67 (2003) 101301
We discuss the importance of including baryons in analyses of unified dark matter scenarios, focusing on toy models involving a generalized Chaplygin gas. We determine observational constraints on this unified dark matter scenario coming from large s
Externí odkaz:
http://arxiv.org/abs/astro-ph/0303564
Publikováno v:
Phys.Rev. D67 (2003) 023511
We discuss the issue of toy model building for the dark energy component of the universe. Specifically, we consider two generic toy models recently proposed as alternatives to quintessence models, known as Cardassian expansion and the Chaplygin gas.
Externí odkaz:
http://arxiv.org/abs/astro-ph/0208528
Akademický článek
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Akademický článek
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Autor:
Beca, L.
Publikováno v:
Proceedings IEEE 9th International Workshops on Enabling Technologies: Infrastructure for Collaborative Enterprises (WET ICE 2000); 2000, p242-247, 6p
