Two-photon annihilation of singlet cold dark matters due to noncommutative space-time

TL;DR

This paper explores how noncommutative space-time allows singlet WIMPs to annihilate into photons directly, potentially enabling indirect dark matter detection via gamma-ray observations.

Contribution

It introduces a novel mechanism for WIMP annihilation into photons in noncommutative space-time, differing from the standard loop process in commutative space-time.

Findings

Certain dark matter masses can be constrained using Fermi-Lat gamma-ray data.

Noncommutative interactions influence relic abundance calculations.

Direct two-photon annihilation becomes possible in noncommutative space-time.

Abstract

Detecting the cosmic rays, in particular gamma-ray, coming from the dark matter annihilation or decay is an indirect way to survey the nature of the dark matter. In the commutative space-time, the annihilation of the dark matter candidates (WIMPs) to photons proceeds through loop corrections. However, it is possible for WIMPs as well as the other standard model singlet particles to couple with photons directly in the noncommutative space-time. In this paper, we study two-photon annihilation of singlet WIMPs in the noncommutative space-time. If the noncommutative interactions are relevant to the relic abundance, one can exclude some dark matter masses using Fermi-Lat data.