I Anomalous Ionization in the Central Molecular Zone by Sub-GeV Dark Matter

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TL;DR Summary

MeV dark matter annihilations into 𝑒+⁢𝑒− pairs

https://journals.aps.org/prl/

Open Access

Anomalous Ionization in the Central Molecular Zone by Sub-GeV Dark Matter

Pedro De la Torre Luque1,2,3,*, Shyam Balaji4,†, and Joseph Silk5,6,7,‡

Phys. Rev. Lett. 134, 101001 – Published 10 March, 2025

Abstract​

We demonstrate that the anomalous ionization rate observed in the Central Molecular Zone can be attributed to MeV dark matter annihilations into 𝑒+⁢𝑒− pairs for galactic dark matter profiles with slopes 𝛾 >1. The low annihilation cross sections required avoid cosmological constraints and imply no detectable inverse Compton, bremsstrahlung, or synchrotron emission in radio, x- and 𝛾 rays. The possible connection with the source of the unexplained 511 keV line emission in the Galactic Center suggests that both observations could be correlated and have a common origin
DOI:https://doi.org/10.1103/PhysRevLett.134.101001.

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MeV dark matter annihilations into 𝑒+⁢𝑒− pairs
i can think of a MeV particle that decay into 𝑒+⁢𝑒− pairs