Publications associated with Particle Theory

Galaxy cluster thermal x-ray spectra constrain axionlike particles

Physical Review D - Particles, Fields, Gravitation and Cosmology 93 (2016)

JP Conlon, AJ Powell, MCD Marsh

© 2016 American Physical Society.Axionlike particles (ALPs) and photons interconvert in the presence of a magnetic field. At keV energies in the environment of galaxy clusters, the conversion probability can become unsuppressed for light ALPs. Conversion of thermal x-ray photons into ALPs can introduce a steplike feature into the cluster thermal bremsstrahlung spectrum, and we argue that existing x-ray data on galaxy clusters should be sufficient to extend bounds on ALPs in the low-mass region ma1×10-12 eV down to M∼7×1011 GeV, and that for 1011 GeV<M1012 GeV light ALPs give rise to interesting and unique observational signatures that may be probed by existing and upcoming x-ray (and potentially x-ray polarization) observations of galaxy clusters.

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