Probing Leptogenesis with the Cosmological Collider

Understand

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.