Gauge-singlet dark matter in a left-right symmetric model with spontaneous CP violation

TL;DR

This paper introduces a gauge-singlet scalar as a dark matter candidate within a left-right symmetric model where P and CP symmetries are spontaneously broken, predicting detectable signals in upcoming experiments.

Contribution

It presents a novel dark matter scenario where stability arises naturally from spontaneous symmetry breaking without extra discrete symmetries.

Findings

Predicted WIMP-nucleon cross section can reach current experimental bounds.

Model parameters constrained by observed relic density.

Potential for near-future experimental verification.

Abstract

We propose a dark matter (DM) scenario in an extension of a left-right symmetric model with a gauge-singlet scalar field. The gauge-singlet scalar can automatically become a DM candidate, provided that both P and CP symmetries are only broken spontaneously. Thus no extra discrete symmetries are needed to make the DM candidate stable. After constraining the model parameters from the observed relic DM density we make predictions for direct detection experiments. We show that for some parameter range, the predicted WIMP-nucleon elastic scattering cross section can reach the current experimental upper bound, which can be tested by the experiments in the near future.