2017/11/23 by Jhilik Majumdar, Francesca Calore, Majumdar, Jhilik +3
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)
paper · pdf · doi:10.48550/arxiv.1711.08723
openalex publication_date 2017/11/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In many approaches to describe physics beyond the standard model, light\nNambu-Goldstone bosons (named axion-like particles or ALPS for their similarity\nwith the axion) are predicted to exist. For ALPs with a mass of neV,\nphoton-ALPs oscillation takes place in extra-galactic magnetic fields during\nthe propagation of very high energy gamma-ray photons leading to excess\nradiation observed for optically thick sources. In order to verify this effect,\ngamma-ray spectra from strong Galactic plane or non-galactic plane sources can\nbe used and the photon-ALPs mixing would lead to an energy dependent\nsuppression of the observed gamma-ray spectra. Here, we have used Fermi-LAT\nobservations of a sample of non Galactic plane gamma-ray pulsars located at\ndifferent line-of-sights to search for spectral signatures and compare the\nresult with the predictions using particular models for the Galactic magnetic\nfield.We find consistent evidence with our prevoius analysis of objects located\nin the Galactic plane for a modulation of the spectra investigated at the level\nof 3.66 standard deviations . In the framework of ALPS-photon oscillation, the\nresulting parameters strongly depend upon the chosen magnetic field model, but\nseem to be within reach of new experiments(e.g. IAXO).\n