Evidence for an axion-like particle from blazar spectra?
High Energy Astrophysical Phenomena
2011-02-08 v1 Cosmology and Nongalactic Astrophysics
High Energy Physics - Phenomenology
Abstract
Observations with the Imaging Atmospheric Cherenkov Telescopes H.E.S.S., MAGIC, CANGAROO III and VERITAS have shown that the Universe is more transparent than expected to gamma rays above 100GeV. As a natural explanation, the DARMA scenario has previously been proposed, wherein photons can oscillate into a new very light axionlike particle and vice-versa in the presence of cosmic magnetic fields. Here we demonstrate that the most recent observations further support the DARMA scenario, thereby making the existence of a very light axion-like particle more likely.
Keywords
Cite
@article{arxiv.1102.1177,
title = {Evidence for an axion-like particle from blazar spectra?},
author = {Marco Roncadelli and Alessandro De Angelis and Giorgio Galanti and Massimo Persic},
journal= {arXiv preprint arXiv:1102.1177},
year = {2011}
}
Comments
4 pages, 1 figure. Proceeding of the "6th Patras Workshop on Axions, WIMPs and WISPs", Zurich, Switzerland, 5 - 9 July 2010 (to appear in the Proceedings)