Kevork Abazajian (Fermilab)
"Direct Detection of Dark Matter in the X-ray"


Singlet (sterile) neutrinos, a natural candidate for warm or cold dark matter, arise in simple extensions of the neutrino sector of the standard model of particle physics as well as under the aegis of supersymmetric models. The required coupling of the singlets with active neutrinos for their production in the early universe imposes a radiative decay mode whose X-ray line signature can be detected or constrained by observations of nearby galaxy clusters. Taking into account Lyman-alpha forest and reionization limits, the presently unconstrained range of singlet mass can behave as warm dark matter, suppressing small scale structure and softening core densities, or as standard cold dark matter. Coincidentally, this mass range is readily detectable by current X-ray observatories. I describe current observational efforts, as well as how this novel detection can probe the epoch of dark matter production and the nature of the QCD transition.

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