Integrated Sachs-Wolfe effect in a quintessence cosmological model: Including anisotropic stress of dark energy

Journal Article · Fri Oct 15 04:00:00 EDT 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.82.083522· OSTI ID:21432367

Wang, Y T; Xu, L X; Gui, Y X ^[1]

---

1. School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian, Liaoning 116024 (China)

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+3/2xc-circumflex{sub s}{sup 2}) and that of {delta}{sub de}/{delta}{sub m} with the variation of c-circumflex{sub s}{sup 2}.

• OSTI ID: 21432367
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 8 Vol. 82; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
79 ASTRONOMY AND ASTROPHYSICS
ANISOTROPY
COSMOLOGICAL MODELS
DENSITY
DISTURBANCES
EQUATIONS
EQUATIONS OF STATE
MATHEMATICAL MODELS
MATTER
NONLUMINOUS MATTER
PERTURBATION THEORY
PHYSICAL PROPERTIES
SOUND WAVES
SPECTRA
VELOCITY