Probing Leptogenesis with the Cosmological Collider

TL;DR

This paper proposes using cosmological collider physics, specifically primordial non-Gaussianity patterns during inflation, to probe leptogenesis and extract information about lepton-number violation, neutrino masses, and CP phases.

Contribution

It introduces a novel method to test leptogenesis through observable signatures in primordial non-Gaussianity during inflation.

Findings

Detectable oscillatory non-Gaussianity patterns linked to leptogenesis parameters

Primordial signals encode lepton-number violation and neutrino mass information

Demonstrates feasibility of probing high-energy leptogenesis models with cosmological data

Abstract

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.