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Indexed by:期刊论文

Date of Publication:2015-02-11

Journal:JOURNAL OF HIGH ENERGY PHYSICS

Included Journals:SCIE、Scopus

Volume:2015

Issue:2

Page Number:1-26

ISSN No.:1029-8479

Key Words:Cosmology of Theories beyond the SM; Classical Theories of Gravity

Abstract:In this paper, we study cosmologies containing the reduced modified Chaplygin gas (RMCG) fluid which is reduced from the modified Chaplygin gas p = A rho - B rho(-alpha) for the value of alpha = -1/2. In this special case, dark cosmological models can be realized for different values of model parameter A. We investigate the viabilities of these dark cosmological models by discussing the evolutions of cosmological quantities and using the currently available cosmic observations. It is shown that the special RMCG model (A = 0 or A = 1) which unifies the dark matter and dark energy should be abandoned. For A = 1/3, RMCG which unifies the dark energy and dark radiation is the favorite model according to the objective Akaike information criteria. In the case of A < 0, RMCG can achieve the features of the dynamical quintessence and phantom models, where the evolution of the universe is not sensitive to the variation of model parameters.