Higgs Thermal Nonequilibrium in Primordial QGP

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 ${{\rm Y}}_h=0.69$ 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.

Comments: 9 large EPJ pages, 5 figures, explanatory paragraphs added, published in EPJST for collection on Particles and Plasma 2024