2012/12/31 by Fedor Bezrukov, Georgios K. Karananas, Javier Rubio +1 · 2 citations
Physics and Astronomy · #hep-ph #astro-ph.CO #hep-th
paper · pdf · doi:10.1103/physrevd.87.096001
published as Phys. Rev. D 87, 096001 (2013) · typos corrected, references and appendix added, published version
arxiv created 2013/05/06 · arxiv updated 2013/05/07
The Higgs-Dilaton cosmological model is able to describe simultaneously an inflationary expansion in the early Universe and a dark energy dominated stage responsible for the present day acceleration. It also leads to a non-trivial relation between the spectral tilt of scalar perturbations ns and the dark energy equation of state ω. We study the self-consistency of this model from an effective field theory point of view. Taking into account the influence of the dynamical background fields, we determine the effective cut-off of the theory, which turns out to be parametrically larger than all the relevant energy scales from inflation to the present epoch. We finally formulate the set of assumptions needed to estimate the amplitude of the quantum corrections in a systematic way and show that the connection between ns and ωremains unaltered if these assumptions are satisfied.