Thermal Right-Handed Sneutrino Dark Matter

TL;DR

This paper explores right-handed sneutrinos as thermal dark matter candidates within a supersymmetric hybrid inflation model, highlighting a new coupling that enables sufficient annihilation compatible with cosmic microwave background observations.

Contribution

It introduces a novel quartic coupling in the F_D-term model that allows right-handed sneutrinos to serve as viable thermal dark matter candidates.

Findings

The model predicts a new quartic coupling enabling efficient sneutrino annihilation.

Favorable parameter space regions are identified within mSUGRA.

The scenario aligns with current cosmic microwave background data.

Abstract

We discuss the relic abundance of the right-handed sneutrinos in the supersymmetric F_D-term model of hybrid inflation. As well as providing a natural solution to the mu- and gravitino overabundance problems, the model offers the lightest right-handed sneutrino as a candidate for thermal dark matter. The F_D-term model predicts a new quartic coupling of purely right-handed sneutrinos to the Higgs doublets that thermalizes the sneutrinos and makes them annihilate sufficiently fast to a level compatible with the current cosmic microwave background data. We discuss this scenario and identify favourable regions of the parameter space within mSUGRA.