Non Thermal Neutralino Production in Deflected Anomaly Mediation

TL;DR

This paper investigates how late-decaying modulus fields can produce neutralinos non-thermally in deflected anomaly mediation, affecting relic densities and detection prospects, with implications for supersymmetric dark matter models.

Contribution

It introduces a detailed analysis of non-thermal neutralino production via modulus decay within deflected anomaly mediation, highlighting new classes of models with low thermal relic density due to coannihilation.

Findings

Models with non-thermal production can have acceptable relic densities despite low thermal values.

Neutralino annihilation cross sections are not significantly higher than typical MSSM values.

Detection prospects for these neutralinos are generally not promising.

Abstract

We study the effects of a non thermal neutralino production, due to the late decay in the early universe of a single modulus field, in the context of the deflected anomaly mediated scenario. In the regime in which the average number of neutralino produced in each modulus decaying process is $\bar{N}_{{\rm LSP}}\ll 1$ also models with a thermal relic density below WMAP data became acceptable models. We find out that these models belong to three different classes with the common feature that the low thermal relic density is entirely due to coannihilation effects. The neutralino annihilation cross section for these classes of models is not particularly high compared with the highest cross sections attainable in the generic framework of the MSSM. Hence the detection prospects either by direct or indirect WIMP search experiments are not encouraging.