New coupled quintessence cosmology
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
18/04/2012
18/04/2012
2008
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Resumo |
A component of dark energy has been recently proposed to explain the current acceleration of the Universe. Unless some unknown symmetry in Nature prevents or suppresses it, such a field may interact with the pressureless component of dark matter, giving rise to the so-called models of coupled quintessence. In this paper we propose a new cosmological scenario where radiation and baryons are conserved, while the dark energy component is decaying into cold dark matter. The dilution of cold dark matter particles, attenuated with respect to the usual a(-3) scaling due to the interacting process, is characterized by a positive parameter epsilon, whereas the dark energy satisfies the equation of state p(x) = omega rho(x) (omega < 0). We carry out a joint statistical analysis involving recent observations from type Ia supernovae, baryon acoustic oscillation peak, and cosmic microwave background shift parameter to check the observational viability of the coupled quintessence scenario here proposed. CNPq[304569/2007-0] CNPq[485662/2006-0] FAPESP[04/13668-0] |
Identificador |
PHYSICAL REVIEW D, v.78, n.6, 2008 1550-7998 http://producao.usp.br/handle/BDPI/15599 10.1103/PhysRevD.78.063514 |
Idioma(s) |
eng |
Publicador |
AMER PHYSICAL SOC |
Relação |
Physical Review D |
Direitos |
restrictedAccess Copyright AMER PHYSICAL SOC |
Palavras-Chave | #HUBBLE-SPACE-TELESCOPE #EXTRAGALACTIC DISTANCE SCALE #INTERACTING DARK ENERGY #PROBE WMAP OBSERVATIONS #DECAYING VACUUM ENERGY #PERIOD-COLOR RELATIONS #IA SUPERNOVAE #REDSHIFT RELATION #KEY PROJECT #CLASSICAL CEPHEIDS #Astronomy & Astrophysics #Physics, Particles & Fields |
Tipo |
article original article publishedVersion |