On the dark energy rest frame and the CMB
Abstract
Dark energy is usually parametrized as a perfect fluid with negative pressure and a certain equation of state. Besides, it is supposed to interact very weakly with the rest of the components of the universe and, as a consequence, there is no reason to expect it to have the same large-scale rest frame as matter and radiation. Thus, apart from its equation of state and its energy density one should also consider its velocity as a free parameter to be determined by observations. This velocity defines a cosmological preferred frame, so the universe becomes anisotropic and, therefore, the CMB temperature fluctuations will be affected, modifying mainly the dipole and the quadrupole.
Cite
@article{arxiv.0812.2206,
title = {On the dark energy rest frame and the CMB},
author = {Jose Beltran Jimenez and Antonio L. Maroto},
journal= {arXiv preprint arXiv:0812.2206},
year = {2015}
}
Comments
4 pages. Contribution to the proceedings of Spanish Relativity Meeting 2008, Salamanca, Spain, 15-19 September 2008