The search for the particle identity of dark matter (DM) continues to be a primary objective in modern physics. In this field, the sub-GeV mass range of DM detection remains a crucial yet challenging window. We investigate synchrotron self-Compton (SSC) emission from electrons and positrons produced by MeV-scale DM annihilation as a novel indirect detection channel. Focusing on the globular cluster Omega Centauri and the sensitivity of the Square Kilometre Array, we derive constraints on the annihilation cross section reaching ⟨σv⟩∼10−30cm3s−1 in the tens-of-MeV range. Furthermore, constraints could even reach below ⟨σv⟩∼10−32cm3s−1 for extreme parameter choices. Remarkably, even under deliberately conservative astrophysical assumptions, this channel outperforms existing indirect limits, establishing SSC emission as a robust probe of sub-GeV DM.
@article{arxiv.2602.08731,
title = {Synchrotron Self-Compton Process for Constraining sub-GeV Dark Matter in Omega Centauri via SKA},
author = {Guan-Sen Wang and Bing-Yu Su and Yang Yu and Bo Zhang and Lei Feng},
journal= {arXiv preprint arXiv:2602.08731},
year = {2026}
}