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SUMMARY:Signatures of axion-like particle dark matter and dark radiation -
  Francesca Day (University of Oxford)
DTSTART:20160122T160000Z
DTEND:20160122T170000Z
UID:TALK62833@talks.cam.ac.uk
CONTACT:Marco Nardecchia
DESCRIPTION:Many extensions of the Standard Model include axions or axion-
 like particles. Such axions are potentially observable via their interacti
 on with electromagnetism\, leading to axion-photon conversion in an extern
 al magnetic field. I will discuss potential observational signatures of ax
 ions in galaxies and galaxy clusters. In particular\, I will present predi
 ctions from a cosmic axion background propagating in galaxies. I will also
  describe a scenario in which the recently observed 3.5 keV photon line is
  caused by dark matter decay to axions\, which then mix with the photon in
  astrophysical magnetic fields. I will motivate this scenario in terms of 
 the observed morphology of the line\, and present predictions unique to th
 is model.
LOCATION:B1.19\, DAMTP
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