# Heavy dark matter particle annihilation in dwarf spheroidal galaxies: radio signals at the SKA telescope

## TL;DR

This paper explores the potential of the upcoming SKA radio telescope to detect signals from heavy dark matter particle annihilation in dwarf spheroidal galaxies, providing a complementary approach to collider searches.

## Contribution

It analyzes the detectability of trans-TeV dark matter via radio signals at SKA, incorporating particle physics, diffusion, and energy loss effects, with benchmark scenarios based on the MSSM.

## Key findings

- Radio flux from Draco could be detectable in 100 hours at SKA for dark matter masses up to 8 TeV.
- Detectability depends on astrophysical parameters, with specific regions identified.
- Complementarity between collider and radio detection methods is emphasized.

## Abstract

A weakly interacting dark matter candidate is difficult to detect at high-energy colliders like the LHC, if its mass is close to, or higher than a TeV. On the other hand, pair-annihilation of such particles may give rise to $e^+ e^-$ pairs in dwarf spheroidal galaxies (dSph), which in turn can lead to radio synchrotron signals that are detectable at the upcoming Square Kilometre Array (SKA) telescope within a moderate observation time. We investigate the circumstances under which this complementarity between collider and radio signals of dark matter can be useful in probing physics beyond the standard model of elementary particles. Both particle physics issues and the roles of diffusion and electromagnetic energy loss of the $e^\pm$ are taken into account. First, the criteria for detectability of trans-TeV dark matter are analysed independently of the particle physics model(s) involved. We thereafter use some benchmarks based on a popular scenario, namely, the minimal supersymmetric standard model. It is thus shown that the radio flux from a dSph like Draco should be observable in about 100 hours at the SKA, for dark matter masses upto 4-8 TeV. In addition, the regions in the space spanned by astrophysical parameters, for which such signals should be detectable at the SKA, are marked out.