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Indexed by:期刊论文

Date of Publication:2010-10-21

Journal:PHYSICAL REVIEW D

Included Journals:SCIE、Scopus

Volume:82

Issue:8

ISSN No.:1550-7998

Abstract:In this paper, we investigate the integrated Sachs-Wolfe effect in the quintessence cold dark matter model with constant equation of state and constant speed of sound in dark energy rest frame, including dark energy perturbation and its anisotropic stress. Comparing with the Lambda CDM model, we find that the integrated Sachs-Wolfe (ISW)-power spectrums are affected by different background evolutions and dark energy perturbation. As we change the speed of sound from 1 to 0 in the quintessence cold dark matter model with given state parameters, it is found that the inclusion of dark energy anisotropic stress makes the variation of magnitude of the ISW source uncertain due to the anticorrelation between the speed of sound and the ratio of dark energy density perturbation contrast to dark matter density perturbation contrast in the ISW-source term. Thus, the magnitude of the ISW-source term is governed by the competition between the alterant multiple of (1 + 3/2 x (c) over cap (2)(s)) and that of delta(de)/delta(m) with the variation of (c) over cap (2)(s).