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Pseudoscalar particles like axion-like particles generically couple to twophotons, giving rise to the possibility of oscillations with photons in anexternal magnetic field. These oscillations could lead to measurable imprintsin the electromagnetic spectrum of astrophysical sources if the coupling tophotons is strong enough. One possible signature is the presence ofirregularities in a limited energy range of the spectrum. In this study,anomalous irregularities are searched for in the spectrum of the brightextragalactic TeV emitter PKS 2155-304 as measured by H.E.S.S. to putconstraints on the coupling of light spin 0 particles to photons.

Constraints on axion-like particles from gamma-ray astronomy with H.E.S.S