Direct/indirect detection signatures of nonthermally produced dark matter

TL;DR

This paper explores how non-thermally produced neutralino dark matter can be detected through gamma-ray and positron signals, with upcoming experiments like GLAST and PAMELA capable of confirming or constraining these models.

Contribution

It analyzes detection signatures of nonthermal neutralino dark matter, highlighting the impact of large annihilation cross sections on gamma-ray and positron signals, and assesses experimental prospects.

Findings

Gamma-ray signals from the Galactic Center are significantly enhanced.

Positron flux from dark matter annihilation is notably increased.

Upcoming experiments can test or constrain nonthermal dark matter scenarios.

Abstract

We study direct and indirect detection possibilities of neutralino dark matter produced non-thermally by e.g. the decay of long-lived particles, as is easily implemented in the case of anomaly or mirage mediation models. In this scenario, large self-annihilation cross sections are required to account for the present dark matter abundance, and it leads to significant enhancement of the gamma-ray signature from the Galactic Center and the positron flux from the dark matter annihilation. It is found that GLAST and PAMELA will find the signal or give tight constraints on such nonthermal production scenarios of neutralino dark matter.