Astrophysical signatures of axions
- Event time: 2:00pm
- Event date: 11th February 2016
- Speaker: Francesca Day (University of Oxford)
- Location: Higgs Centre Seminar Room, James Clerk Maxwell Building (JCMB) James Clerk Maxwell Building Peter Guthrie Tait Road Edinburgh EH9 3FD GB
Many extensions of the Standard Model include axions or axion-like particles. Such axions are potentially observable via their interaction with electromagnetism, leading to axion-photon conversion in an external magnetic field. I will discuss potential observational signatures of axions in galaxies and galaxy clusters. In particular, I will present predictions 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 this model.
The Particle Physics Theory seminar is a weekly series of talks reflecting the diverse interests of the group. Topics include analytic and numerical calculations based on the Standard Model of elementary particle physics, theories exploring new physics, as well as more formal developments in gauge theories and gravity..