Renormalization Group independence of Cosmological Attractors
  The large class of inflationary models known as $\alpha$- and
$\xi$-attractors gives identical cosmological predictions at tree level (at
leading order in inverse power of the number of efolds). Working with the
renormalization group improved action, we show that these predictions are
robust under quantum corrections. This means that for all the models considered
the inflationary parameters $(n_s,r)$ are (nearly) independent on the
Renormalization Group flow. The result follows once the field dependence of the
renormalization scale, fixed by demanding the leading log correction to vanish,
satisfies a quite generic condition. In Higgs inflation (which is a particular
$\xi$-attractor) this is indeed the case; in the more general attractor models
this is still ensured by the renormalizability of the theory in the effective
field theory sense.
