A new light boson from MAGIC observations?
Marco Roncadelli (1), Alessandro De Angelis (2), Oriana Mansutti (3), ((1) INFN, Sezione di Pavia, Italy, (2) Dipartimento di Fisica, Universita', di Udine, and INAF, INFN, Sezioni di Trieste, Italy, (3)Dipartimento di, Fisica, Universita' di Udine, and INFN, Sezione di Trieste
TL;DR
Recent gamma-ray observations suggest the universe is more transparent than expected, which can be explained by photon oscillations into a light axion-like particle in extragalactic magnetic fields, a hypothesis testable by current and upcoming telescopes.
Contribution
Proposes the DARMA scenario where photon-axion oscillations explain gamma-ray transparency, linking astrophysical observations with particle physics.
Findings
Blazar 3C279 detection confirms increased universe transparency.
Photon oscillations into axion-like particles could explain observations.
Testable predictions for current and future gamma-ray telescopes.
Abstract
Recent detection of blazar 3C279 by MAGIC has confirmed previous indications by H.E.S.S. that the Universe is more transparent to very-high-energy gamma rays than currently thought. This circumstance can be reconciled with observations of nearby blazars provided that photon oscillations into a very light Axion-Like Particle occur in extragalactic magnetic fields. The emerging "DARMA scenario" can be tested in the near future by the satellite-borne Fermi LAT detector as well as by the ground-based Imaging Atmospheric Cherenkov Telescopes H.E.S.S., MAGIC, CANGAROO III, VERITAS and by the Extensive Air Shower arrays ARGO-YBJ and MILAGRO.
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