Spacetime curvature and the Higgs stability during inflation
  It has been claimed that the electroweak vacuum may be unstable during
inflation due to large fluctuations of order $H$ in case of a high inflationary
scale as suggested by BICEP2. We compute the Standard Model Higgs effective
potential including UV-induced curvature corrections at one-loop level. We find
that for a high inflationary scale a large curvature mass is generated due to
RG running of non-minimal coupling $\xi$, which either stabilizes the potential
against fluctuations for $\xi_{\rm EW} \gtrsim 6\cdot 10^{-2}$, or destabilizes
it for $\xi_{\rm EW} \lesssim 2 \cdot 10^{-2}$ when the generated curvature
mass is negative. Only in the narrow intermediate region the effect of the
curvature mass may be significantly smaller.
