Probing Leptogenesis with the Cosmological Collider
  Leptogenesis is generally challenging to directly test due to the very high
energy scales involved. In this work we propose a new probe for leptogenesis
with cosmological collider physics. With the example of a cosmological Higgs
collider, we demonstrate that during inflation leptogenesis models can produce
detectable primordial non-Gaussianity with distinctive oscillatory patterns
that encode information about the lepton-number violating couplings, the
Majorana right-hand neutrino masses, and the CP phases, which are essential to
leptogenesis.
