Particle candidates for dark matter: a case for (dominant or subdominant) relic neutralinos

TL;DR

This paper examines the detectability of relic neutralinos, a candidate for dark matter, analyzing how their local and cosmological densities affect detection prospects within various supersymmetric models.

Contribution

It provides a comprehensive analysis of how relic neutralinos' detectability relates to their density and explores different supersymmetric scenarios, supported by numerical results.

Findings

Current direct detection experiments probe significant regions of supersymmetric parameter space.

Relic neutralinos can constitute either the dominant or a subdominant component of dark matter.

Detection prospects vary depending on the neutralino's relic density and the supersymmetric model considered.

Abstract

After a short introduction on particle candidates for dark matter within possible extensions of the standard model, we concentrate on Weakly Interacting Massive Particles, and on one of their most interesting physical realizations: the neutralino. We analyze how detectability of relic neutralinos by direct and indirect means is related to their local and cosmological densities; we use simple general arguments to discusss different scenarios where relic neutralinos make up the dominant bulk of dark matter or only a small fraction of it. Our general arguments are further corroborated by specific numerical results. We show to which extent the present experiments of direct searches for WIMPs, when interpreted in terms of relic neutralinos, probe interesting regions of the supersymmetric parameter space. Our analysis is performed in a number of different supersymmetric schemes.