EW baryogenesis via DM

TL;DR

This paper explores how a faster early-universe expansion affects electroweak baryogenesis, especially in models with modified Higgs potentials, and discusses experimental bounds and detection prospects.

Contribution

It demonstrates that cosmological modifications can enable electroweak baryogenesis in the Standard Model with a dimension six operator, affecting Higgs coupling measurements.

Findings

Electroweak baryogenesis can occur with modified cosmology.

Detection of Higgs coupling deviations may be below HL-LHC sensitivity.

Experimental bounds constrain cosmological modifications.

Abstract

We discuss the impact of a swifter cosmological expansion induced by modified cosmological history of the universe on scenarios realising electroweak baryogenesis. We detail the possible experimental bounds one can place on such cosmological modification and show how the detection capabilities of particle models are modified within these bounds. On the particle physics side we focus on the Standard Model supplemented by a dimension six operator which directly modifies the Higgs potential. We show that due to the cosmological modification, electroweak baryogenesis in this model can be realized, with the modification of the triple Higgs coupling below HL-LHC sensitivity.