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This Week at Physics

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Event Number 3447

  Tuesday, October 28th, 2014

Theory Seminar (High Energy/Cosmology)
Galactic Center Gamma-ray Excess from a Dark Shower
Time: 3:00 pm
Place: 5280 Chamberlin Hall
Speaker: Dean Robinson, University of California, Berkeley
Abstract: The reported excess of gamma-rays, emitted from an extended region around the galactic center, has a distribution and rate suggestive of an origin in dark matter (DM) annihilations. However, the conventional annihilation channels into standard model (SM) b quarks or tau leptons may be in tension with various experimental constraints on antiproton and positron fluxes. We'll discuss a framework that is free from such constraints. The key idea is that the mediators between the dark matter and the SM are themselves part of a strongly coupled sector. DM annihilation produces a dark hadron shower that in turn decays to photons, but without other significant associated cosmic ray production. We'll also discuss an explicit realization of this framework and its phenomenology.
Host: Ran Lu
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