Spacetime curvature and Higgs stability after inflation
  We investigate the dynamics of the Higgs field at the end of inflation in the
minimal scenario consisting of an inflaton field coupled to the Standard Model
only through the non-minimal gravitational coupling $\xi$ of the Higgs field.
Such a coupling is required by renormalisation of the Standard Model in curved
space, and in the current scenario also by vacuum stability during high-scale
inflation. We find that for $\xi\gtrsim 1$, rapidly changing spacetime
curvature at the end of inflation leads to significant production of Higgs
particles, potentially triggering a transition to a negative-energy Planck
scale vacuum state and causing an immediate collapse of the Universe.
