Reconciling dark matter and neutrino masses in mSUGRA

TL;DR

This paper explores how an alternative seesaw mechanism in minimal supergravity models affects neutrino masses and the supersymmetric particle spectrum, highlighting the sneutrino as a viable dark matter candidate consistent with current observations.

Contribution

It introduces a modified neutrino sector in mSUGRA, resulting in the sneutrino becoming the lightest supersymmetric particle and a potential dark matter candidate.

Findings

Sneutrino can be the LSP with correct relic density

Modified spectrum remains compatible with nuclear recoil bounds

Neutrino mass generation impacts supersymmetric phenomenology

Abstract

We study the minimal SUGRA phenomenology in the case of an alternative seesaw mechanism for generating neutrino masses. Changes in the neutrino sector lead to a modification of the supersymmetric particle spectrum and the sneutrino naturally arises as the lightest supersymmetric particle. The obtained sneutrino has a relic density within the WMAP range and is compatible with present nuclear recoil bounds.