Zobrazeno 1 - 10
of 33
pro vyhledávání: '"Costa, F. E. M."'
We investigate the dynamical behaviour of a general class of interacting models in the dark sector in which the phenomenological coupling between cold dark matter and dark energy is a power law of the cosmic scale factor. From numerical simulations w
Externí odkaz:
http://arxiv.org/abs/1709.00122
Autor:
Costa, F. E. M.
The cosmological consequences of a slow rolling scalar field with constant kinetic term in analogy to the vertical movement of a skydiver after reaching terminal velocity are investigated. It is shown that the terminal scalar field hypothesis is quit
Externí odkaz:
http://arxiv.org/abs/1708.03406
The cosmological consequences of an interacting model in which vacuum decay law is deducted from the effect that vacuum decay has on the dark matter evolution are investigated. Here, the baryonic matter is also considered as a fluid gravitationally c
Externí odkaz:
http://arxiv.org/abs/1406.1706
Publikováno v:
Physics Letters. B , v. 728, p. 400-406, 2014
The correspondence between cosmological models powered by a decaying vacuum energy density and gravitationally induced particle production is investigated. Although being physically different in the physics behind them we show that both classes of co
Externí odkaz:
http://arxiv.org/abs/1303.2075
We propose an alternative, nonsingular, cosmic scenario based on gravitationally induced particle production. The model is an attempt to evade the coincidence and cosmological constant problems of the standard model ($\Lambda$CDM) and also to connect
Externí odkaz:
http://arxiv.org/abs/1205.0868
We discuss a new interacting model for the cosmological dark sector in which the attenuated dilution of cold dark matter scales as $a^{-3}f(a)$, where f(a) is an arbitrary function of the cosmic scale factor $a$. From thermodynamic arguments, we show
Externí odkaz:
http://arxiv.org/abs/1204.3066
We discuss the cosmological consequences of an interacting model in the dark sector in which the $\Lambda$ component evolves as a truncated power series of the Hubble parameter. In order to constrain the free parameters of the model we carry out a jo
Externí odkaz:
http://arxiv.org/abs/1204.1864
Autor:
Costa, F. E. M.
Publikováno v:
Phys.Rev.D82:103527,2010
We discuss some cosmological consequences of a general model of coupled quintessence in which the phenomenological coupling between the cold dark matter and dark energy is a function of the cosmic scale factor $\epsilon(a)$. This class of models pres
Externí odkaz:
http://arxiv.org/abs/1009.3841
Autor:
Costa, F. E. M., Alcaniz, J. S.
Publikováno v:
Phys.Rev.D81:043506,2010
We propose a general class of interacting models in which the interaction between the CDM component and $\Lambda$ is parameterized by an arbitrary function of the cosmic scale factor $\epsilon(a)$. Differently from other dynamical $\Lambda$ scenarios
Externí odkaz:
http://arxiv.org/abs/0908.4251
Publikováno v:
Phys.Rev.D79:127302,2009
Unless some unknown symmetry in Nature prevents or suppresses a non-minimal coupling in the dark sector, the dark energy field may interact with the pressureless component of dark matter. In this paper, we investigate some cosmological consequences o
Externí odkaz:
http://arxiv.org/abs/0905.0672