Anomalous X-Ray Galactic signal from 7 keV spin-$3/2$ dark matter decay

Abstract

In order to explain the recently reported peak at $3.55$ keV in the galactic x-ray spectrum, we propose a simple model. In this model, the Standard Model is extended by including a neutral spin-$3/2$ vector-like fermion that transforms like a singlet under SM gauge group. This $7.1$ keV spin-$3/2$ fermion is considered to comprise a portion of the observed dark matter. Its decay into a neutrino and a photon with decay life commensurate with the observed data, fits the relic dark matter density and obeys the astrophysical constraints from the supernova cooling.

13 pages and 2 Figures

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• Minimal Spin-3/2 Dark Matter in a simple $s$-channel model
• Spin-3/2 dark matter in a simple $t$-channel model
• Hidden Spin-3/2 Field in the Standard Model
• Neutrino specific spin-3/2 dark matter