Baryon and lepton asymmetry of the Universe in the left-right asymmetry model of weak interaction

TL;DR

This paper explores how the left-right asymmetry model of weak interaction can explain baryon and lepton asymmetries in the Universe, linking CP violation, neutron decay differences, and sterile neutrinos to cosmic matter-antimatter imbalance.

Contribution

It introduces a mechanism within the left-right asymmetry model that accounts for baryon and lepton asymmetries, including dark matter formation via sterile neutrinos.

Findings

Baryon asymmetry arises during quark-gluon plasma hadronization.

Lepton asymmetry is linked to sterile neutrinos leaving the plasma.

The model satisfies Sakharov's conditions for baryogenesis.

Abstract

The formation of baryon asymmetry in the Universe is considered in the left-right asymmetry model of weak interaction. In this model, the nature of CP violation is associated with the presence of a right vector boson admixture, with a mixing angle of different signs for W^- and W^+. This leads to the fact that lifetimes of neutrons and antineutrons that decay through W^- and W^+ differ. This difference gives rise to baryon asymmetry during the hadronization of quark-gluon plasma at temperatures below 150 MeV. During the phase transition from quark-gluon plasma to hadronic liquid, all three of A.D. Sakharov's conditions for the generation of baryon asymmetry in the Universe are satisfied: CP violation and process nonstationarity, resulting in baryon number violation due to the difference in the decay probabilities of neutrons and antineutrons. The generation of lepton asymmetry in the Universe in the left-right asymmetry model is associated with the presence of sterile (right) neutrinos, which do not thermalize and leave the cosmic plasma, takes away a lepton asymmetry with a sign opposite to the baryon asymmetry. Generally, baryon-lepton asymmetry arises during the hadronization of quark-gluon plasma, preserving the difference between the baryon and lepton numbers. A mechanism for the formation of dark matter by sterile neutrinos is presented. The possibility of increasing the experimental accuracy of neutron decay asymmetry measurements is noted, increasing the level of confidence in the validity of the left-right asymmetry model of weak interactions.