Have Cherenkov telescopes detected a new light boson?

Details Have Cherenkov telescopes detected a new light boson? Have Cherenkov telescopes detected a new light boson?

2010-02-24

arxiv.org/abs/1002.4523v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

3 pages, 1 figure, Proceeding of the "Eleventh International Workshop on Topics in Astroparticle and Underground Physics" (TAU

Scientific paper

Recent observations by H.E.S.S. and MAGIC strongly suggest that the Universe is more transparent to very-high-energy gamma rays than previously thought. We show that this fact can be reconciled with standard blazar emission models provided that photon oscillations into a very light Axion-Like Particle occur in extragalactic magnetic fields. A quantitative estimate of this effect indeed explains the observed data and in particular the spectrum of blazar 3C279.

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