Signatures of axion-like particle dark matter and dark radiation

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• Francesca Day (University of Oxford)
• Friday 22 January 2016, 16:00-17:00
• B1.19, DAMTP.

If you have a question about this talk, please contact Marco Nardecchia.

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.

This talk is part of the HEP phenomenology joint Cavendish-DAMTP seminar series.

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