Standard Model CP and Baryon Number Violation in Cold Electroweak Cosmology

TL;DR

This paper proposes a mechanism within the Standard Model where baryon asymmetry arises during cold electroweak cosmology through Higgs bags and sphaleron transitions, with CP violation causing a tiny top-antitop imbalance.

Contribution

It demonstrates that Standard Model processes, combined with specific cosmological conditions, can account for baryon asymmetry, challenging the belief that new physics is necessary.

Findings

Baryon number violation levels of 10^{-2} to 10^{-3}

Top-antitop population difference of about 10^{-9} due to CP violation

Higgs bags and sphalerons facilitate baryogenesis in this scenario

Abstract

Contrary to popular beliefs, it is possible to explain Baryonic asymmetry of the Universe inside the Standard Model, provided inflation ended into a broken phase below the electroweak transition. Two important ingredients of the solution are multiquanta "Higgs bags", containing W,Z and top quarks, as well as sphaleron transitions happening inside these bags. Together, they provide baryon number violation at the level $10^{-2..3}$. Our recent calculations show that CP violation (due to the usual CKM matrix of quark masses in the 4-th order) leads to top-antitop population difference in these bags of about $10^{-9}$. (The numbers mentioned are not yet optimized and simply follow a choice made by some numerical simulations of the bosonic fields we used as a reference point.)