Publication: On the dark energy rest frame and the CMB
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2009
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American Institute of Physics
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Abstract
Dark energy is usually parametrized as a perfect fliud 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 w and its energy density Q.DE 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.
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© 2009 American Institute of Physics. Spanish Relativity Conference (31st. 2008. Salamanca, Spain). We would like to thank the organizing committee of the Spanish Relativity Meeting ERE 2008 for their hospitality and exceUent organization. This work has been supported by DGICYT (Spain) project numbers EPA 2004-02602 and EPA 2005-02327, UCMSantander PR34/07-15875, CAM/UCM 910309 and MEC grant BES-2006-12059.