Axion-like particles: possible hints and constraints from the high-energy Universe

Abstract

The high-energy Universe is potentially a great laboratory for searching new light bosons such as axion-like particles (ALPs). Cosmic sources are indeed the scene of violent phenomena that involve strong magnetic field and/or very long baselines, where the effects of the mixing of photons with ALPs could lead to observable effects. Two examples are archetypal of this fact, that are the Universe opacity to gamma-rays and the imprints of astrophysical magnetic turbulence in the energy spectra of high-energy sources. In the first case, hints for the existence of ALPs can be proposed whereas the second one is used to put constraints on the ALP mass and coupling to photons.

10 pages, Invited talk at TPC 2012 Paris

References in corpus (10)

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Cited by in corpus (5)

• CAST solar axion search with 3^He buffer gas: Closing the hot dark matter gap
• A GeV-TeV Measurement of the Extragalactic Background Light
• Direct Detection of Dark Matter -- APPEC Committee Report
• Axion-photon Propagation in Magnetized Universe
• Search for an interaction mediated by axion-like particles with ultracold neutrons at the PSI