Higgs Thermal Nonequilibrium in Primordial QGP

TL;DR

This paper studies the nonequilibrium behavior of Higgs bosons in the early universe's quark-gluon plasma, revealing persistent chemical imbalance and a cold momentum distribution at lower temperatures.

Contribution

It provides the first detailed analysis of Higgs nonequilibrium dynamics during the primordial QGP epoch, highlighting virtual decay effects and momentum distribution characteristics.

Findings

Higgs bosons are always out of chemical equilibrium with fugacity 0.69.

Higgs momentum distribution becomes 'cold' below 25 GeV.

Scattering rate drops below production rate at lower temperatures.

Abstract

In this work we investigate the chemical and kinetic nonequilibrium dynamics of the Higgs boson during the primordial Universe QGP (quark-gluon plasma) epoch $130\mathrm{\,GeV}>T>10\mathrm{\,GeV}$. We show that the Higgs bosons is always out of chemical abundance equilibrium with a fugacity $\Upsilon_h = 0.69$ due to virtual decay channels. Additionally, Higgs momentum distribution is found to be ``cold'' for $T<25$\,GeV, since the scattering rate drops below the production rate.