Renormalization Group Equations of Higgs-$R^2$ Inflation
  We derive one- and two-loop renormalization group equations (RGEs) of
Higgs-$R^2$ inflation. This model has a non-minimal coupling between the Higgs
and the Ricci scalar and a Ricci scalar squared term on top of the standard
model. The RGEs derived in this paper are valid as long as the energy scale of
interest (in the Einstein frame) is below the Planck scale. We also discuss
implications to the inflationary predictions and the electroweak vacuum
metastability.
