Higgs-Dilaton Cosmology: an effective field theory approach

Understand

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 n_s and the dark energy equation of state \omega.
• 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.