Relic density in nonuniversal gaugino mass models with SO(10) GUT symmetry

TL;DR

This paper investigates how nonuniversal gaugino masses arising from SO(10) GUT representations affect neutralino dark matter relic density, comparing results with universal gaugino mass scenarios.

Contribution

It provides a detailed analysis of relic densities in nonuniversal gaugino mass models derived from SO(10) representations, highlighting differences from universal models.

Findings

Relic densities compatible with WMAP are achieved in nonuniversal models.

Mass spectra vary significantly from universal gaugino mass scenarios.

The composition of the lightest neutralino is affected by the nonuniversal boundary conditions.

Abstract

Non-universal boundary conditions in grand unified theories can lead to nonuniversal gaugino masses at the unification scale. In R-parity preserving theories the lightest supersymmetric particle is a natural candidate for the dark matter. The composition of the lightest neutralino and the identity of the next-to-lightest supersymmetric particle are studied, when nonuniversal gaugino masses come from representations of SO(10). In these cases, the thermal relic density compatible with the Wilkinson Microwave Anisotropy Probe observations is found. Relic densities are compared with the universal case. Mass spectra in the studied cases are discussed.