New gamma ray signal from gravitationally boosted neutralinos at the galactic center

TL;DR

This paper explores how gravitational boosts near the galactic center's black hole could enable neutralino dark matter particles to annihilate into stau pairs, producing detectable gamma-ray signals.

Contribution

It introduces a novel mechanism for neutralino annihilation into stau pairs near the galactic center, with detailed gamma-ray spectrum predictions for observational prospects.

Findings

Gamma-ray signals from boosted neutralino annihilation are potentially observable.

The model predicts specific gamma-ray spectral features from tau pair decay.

Boosted annihilation channels could explain certain unexplained gamma-ray observations.

Abstract

We discuss on the possibility that colliding dark matter particles in the form of neutralinos may be gravitationally boosted near the super-massive black hole at the galactic center so that they can have enough collision energy to annihilate into a stau pair. Since in some phenomenologically favored supersymmetric models the mass splitting between the neutralino and the lightest stau, one of the two scalar superpartners of the tau lepton, is a few GeVs, this channel may be allowed. In addition, staus can only decay into a tau lepton and another neutralino. We calculate the gamma-ray spectrum and flux generated by the tau pair discussing the observability of the obtained features.