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Indexed by:期刊论文

Date of Publication:2009-11-01

Journal:EUROPEAN PHYSICAL JOURNAL C

Included Journals:SCIE、Scopus

Volume:64

Issue:1

Page Number:89-95

ISSN No.:1434-6044

Abstract:In this paper, we consider generalized holographic and Ricci dark energy models where the energy densities are given as rho(R) = 3(c)(2)M(pl)(2)Rf (H(2)/R) and rho(h) = 3(c)(2)M(pl)(2)H(g)(2)(R/H(2)), respectively; here f (x), g(y) are positive defined functions of the dimensionless variables H2/R or R/H(2). It is interesting that holographic and Ricci dark energy densities are recovered or recovered interchangeably when the function f (x) = g(y)  1 or f (x) = Id and g(y) = Id are taken, respectively (for example f (x), g(x) = 1 - subset of(1 -x), subset of = 0 or 1, respectively). Also, when f (x) = xg(1/x) is taken, the Ricci and holographic dark energy models are equivalent to a generalized one. When the simple forms f (x) = 1- is an element of (1-x) and g(y) = 1- eta(1-y) are taken as examples, by using current cosmic observational data, generalized dark energy models are considered. As expected, in these cases, the results show that they are equivalent (is an element of = 1- eta = 1.312), and Ricci-like dark energy is more favored relative to the holographic one where the Hubble horizon was taken as an IR cut-off. And the suggested combination of holographic and Ricci dark energy components would be 1.312R -0.312H(2), which is 2.312H2 + 1.312H. in terms of H(2) and H