Physics
Scientific paper
Mar 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1223..128r&link_type=abstract
SCIENCE WITH THE NEW GENERATION OF HIGH ENERGY GAMMA-RAY EXPERIMENTS: Proceedings of the 7th Workshop on Gamma-Ray Physics in th
Physics
Astronomical Telescopes, Gamma-Ray Sources (Astronomical), Standard Model, Dark Matter, Galactic Centre, Galaxies, X- And Gamma-Ray Telescopes And Instrumentation, Gamma-Ray, Standard-Model Higgs Bosons, Dark Matter, Galactic Center, Bar, Circumnuclear Matter, And Bulge, Galactic Halo
Scientific paper
A generic prediction of several extensions of the Standard Model of elementary-particle interactions is the existence of axion-like particles (ALPs), namely very light spin-zero bosons characterized by a two-photon coupling. While elusive in laboratory experiments, ALPs can give rise to observable astrophysical effects for their relevant parameters in experimentally allowed ranges. We show that the unexpectedly low opacity of the Universe inferred by the Imaging Atmospheric Cherenkov Telescopes since 2006 from blazar observations above 100 GeV can be explained naturally within the De Angelis, Roncadelli & Mansutti-hereafter DARMA-scenario, namely in terms of photon-ALP oscillations occurring in extragalactic magnetic fields. We work out the implications of the DARMA scenario for the VHE gamma-ray spectra of blazars by contemplating all of them at once, so that the emitted Γem and observed Γobs spectral indices can be correlated. We demonstrate that by assuming the same nominal value Γem~=2.4 for all VHE blazars, the predicted observed spectral index ΓobsDARMA actually fits all observations. Moreover, ΓobsDARMA becomes independent of redshift for sufficiently far-away sources. Our prediction can be tested with the satellite-borne Fermi/LAT detector as well as with the ground-based IACTs H.E.S.S., MAGIC, CANGAROO III, VERITAS and the Extensive Air Shower arrays ARGO-YBJ and MILAGRO.
de Angelis Alessandro
Mansutti Oriana
Persic Massimo
Roncadelli Marco
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