Leptogenesis, Dark Matter and Gravitational Waves from Discrete Symmetry Breaking

TL;DR

This paper proposes a model linking neutrino physics, dark matter, and gravitational waves through a discrete symmetry breaking, explaining baryon asymmetry and predicting detectable gravitational wave signals.

Contribution

It introduces a novel discrete symmetry breaking mechanism that connects neutrino and dark sectors, generating baryon asymmetry and gravitational wave signals.

Findings

The model successfully explains the observed baryon asymmetry.

Predicts gravitational wave signals within experimental reach.

Establishes a link between symmetry breaking scale and observable phenomena.

Abstract

We analyse a model that connects the neutrino sector and the dark sector of the universe via a mediator $\Phi$, stabilised by a discrete $Z_4$ symmetry that breaks to a remnant $Z_2$ upon $\Phi$ acquiring a non-zero vacuum expectation value ($v_\phi$). The model accounts for the observed baryon asymmetry of the universe via additional contributions to the canonical Type-I leptogenesis. The $Z_4$ symmetry breaking scale ($v_\phi$) in the model not only establishes a connection between the neutrino sector and the dark sector, but could also lead to gravitational wave signals that are within the reach of current and future experimental sensitivities.