PeV scale Left-Right symmetry and baryon asymmetry of the Universe

TL;DR

This paper explores low-scale supersymmetric Left-Right symmetric models, demonstrating their potential to explain baryon asymmetry through phase transitions and leptogenesis, with implications for future collider and cosmology tests.

Contribution

It introduces two supersymmetric Left-Right models with low $B-L$ breaking scale and shows how their phase transitions can facilitate leptogenesis, constraining model parameters.

Findings

Domain walls from phase transition enable $CP$ violation for leptogenesis.

Soft resonant leptogenesis is viable under certain conditions.

Models may be testable in upcoming collider and cosmological experiments.

Abstract

We study the cosmology of two versions of supersymmetric Left-Right symmetric model. The scale of the $B-L$ symmetry breaking in these models is naturally low, $10^4 - 10^6$ GeV. Spontaneous breakdown of parity is accompanied by a first order phase transition. We simulate the domain walls of the phase transition and show that they provide requisite conditions, specifically, $CP$ violating phase needed for leptogenesis. Additionally soft resonant leptogenesis is conditionally viable in the two models considered. Some of the parameters in the soft supersymmetry breaking terms are shown to be constrained from these considerations. It is argued that the models may be testable in upcoming collider and cosmology experiments.