Gravitational Waves from Oscillons with Cuspy Potentials
  We study the production of gravitational waves during oscillations of the
inflaton around the minimum of a cuspy potential after inflation. We find that
a cusp in the potential can trigger copious oscillon formation, which sources a
characteristic energy spectrum of gravitational waves with double peaks. The
discovery of such a double-peak spectrum could test the underlying inflationary
physics.
