X-ray lines from R-parity violating decays of keV sparticles

Understand

If R-parity is only mildly violated then the lightest supersymmetric particle (LSP) can be stable over cosmologically time-scales and still account for the dark matter relic density.

• We examine the possibility of generating detectable X-ray lines from R-parity violating decays of keV-scale LSP dark matter to neutrino-photon pairs.
• Specifically, we consider scenarios in which the LSP is a light gravitino, bino, or hidden sector photino.
• Potential signals are discussed in the context of recent claims of an unidentified 3.5 keV X-ray line in studies of stacked galaxy clusters.