Baryogenesis in false vacuum

TL;DR

This paper proposes a novel leptogenesis mechanism occurring in a false vacuum of the Higgs field, where a large Higgs vacuum expectation value enhances lepton number violation, enabling baryogenesis without new physics at accessible scales.

Contribution

It introduces a new baryogenesis scenario in the false vacuum of the Higgs field, utilizing high-scale physics and higher-dimensional operators within the standard model framework.

Findings

Successfully generates observed baryon asymmetry

Demonstrates viability within standard model with higher-dimensional operators

Proposes leptogenesis in a false vacuum scenario

Abstract

The null result in the LHC may indicate that the standard model is not drastically modified up to very high scales such as the GUT/string scale. Having this in the mind, we suggest a novel leptogenesis scenario realized in the false vacuum of the Higgs field. If the Higgs field develops a large vacuum expectation value in the early universe, a lepton number violating process is enhanced, which we use for baryogenesis. To demonstrate the scenario, several models are discussed. For example, we show that the observed baryon asymmetry is successfully generated in the standard model with higher-dimensional operators.