Tunnelling in Dante's Inferno
  We study quantum tunnelling in Dante's Inferno model of large field
inflation. Such a tunnelling process, which will terminate inflation, becomes
problematic if the tunnelling rate is rapid compared to the Hubble time scale
at the time of inflation. Consequently, we constrain the parameter space of
Dante's Inferno model by demanding a suppressed tunnelling rate during
inflation. The constraints are derived and explicit numerical bounds are
provided for representative examples. Our considerations are at the level of an
effective field theory; hence, the presented constraints have to hold
regardless of any UV completion.
