Spontaneous Leptogenesis in Higgs Inflation

TL;DR

This paper presents a novel spontaneous leptogenesis mechanism during Higgs inflation, utilizing higher-dimensional operators to generate lepton asymmetry that explains the universe's baryon asymmetry, compatible with high reheating temperatures.

Contribution

It introduces a new leptogenesis scenario involving Weinberg and derivative operators during Higgs inflation, linking lepton asymmetry to Higgs dynamics in the early universe.

Findings

Lepton asymmetry is significantly enhanced during Higgs inflation reheating.

The proposed mechanism is compatible with high reheating temperatures.

Lepton asymmetry is successfully converted into baryon asymmetry.

Abstract

We propose a scenario of spontaneous leptogenesis in Higgs inflation with help from two additional operators: the Weinberg operator (Dim 5) and the derivative coupling of the Higgs field and the current of lepton number (Dim 6). The former is responsible for lepton number violation and the latter induces chemical potential for lepton number. The period of rapidly changing Higgs field, naturally realized in Higgs inflation during the reheating, allows large enhancement in the produced asymmetry in lepton number, which is eventually converted into baryon asymmetry of the universe. This scenario is compatible with high reheating temperature of Higgs inflation model.