Does the Electron EDM Preclude Electroweak Baryogenesis ?

TL;DR

This paper explores how recent advances in quantum transport theory and CP-conserving interactions can relax electron EDM constraints, potentially making electroweak baryogenesis a more viable explanation for the universe's matter-antimatter asymmetry.

Contribution

It demonstrates that incorporating first-order gradient CP-violating sources and realistic CP-conserving interactions in EWBG models relaxes EDM constraints and enhances the viability of baryogenesis.

Findings

Relaxed EDM constraints with new quantum transport developments

Enhanced EWBG viability through first-order gradient sources

Impact of CP-conserving interactions on baryon asymmetry predictions

Abstract

Electroweak baryogenesis (EWBG) constitutes a theoretically compelling and experimentally testable mechanism for explaining the origin of the baryon asymmetry of the universe (BAU). New results for the electric dipole moment (EDM) of the electron place significant constraints on the beyond Standard Model CP-violation needed for successful EWBG. Using a specific model illustration, we show how new developments in EWBG quantum transport theory that include CP-violating sources first order in gradients imply more relaxed EDM constraints -- and thereby greater EWBG viability -- than implied by previous approximation formulations. We also illustrate how these developments enable a more realistic treatment of CP-conserving interactions that can also have a decisive impact on the predicted BAU.