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Searches for fundamental physics with X-ray telescopes

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If you have a question about this talk, please contact Tobias Baldauf.

X-ray telescopes are an exceptional tool for discovering or constraining new fundamental physics. I will discuss two searches for new physics using X-ray observations of galaxy clusters. Firstly, we search for axions by observing the spectra of point sources shining through the large scale magnetic fields of galaxy clusters. Secondly, I will review the status of the anomalous 3.5 keV line observed in 2014 by Bulbul et al and Boyarsky et al. I will discuss our recent discovery of an absorption feature at 3.5 keV in the AGN at the centre of the Perseus galaxy cluster, and how these anomalies may be linked. Finally, I will describe how the next generation of X-ray telescopes, featuring far superior energy resolution and polarimetry capabilities, will improve the search for fundamental physics.

This talk is part of the Cosmology Lunch series.

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