2013/05/18 by A. O. Barvinsky, Barvinsky, A. O.
Physics and Astronomy · #Astronomy and Astrophysical Research #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #gr-qc #hep-th
paper · pdf · doi:10.48550/arxiv.1305.4223
4 pages, revtex
arxiv created 2013/05/18 · arxiv updated 2013/05/21
Initial conditions in cosmology in the form of the microcanonical density matrix of the Universe predict a thermal nature of the primordial CMB power spectrum with a nonzero temperature of the resulting relict temperature distribution. This effect generates a thermal contribution to the red tilt of this spectrum, additional to its vacuum component. In the cosmological model with a large number of free fields conformally coupled to gravity the magnitude of this effect is determined by the Gauss-Bonnet coefficient \boldmatha of the trace anomaly. For low spins it is too small to be presently observable, but it can be amplified by the mechanism of the \boldmatha-theorem applied to the renormalization group flow which interpolates between the ultraviolet and infrared domains associated respectively with early and late stages of cosmological evolution.