23-27 May 2016
Europe/Madrid timezone

Limits on Cosmic ALPs Background from cosmic reionization

26 May 2016, 15:00
Contributed talk Astro/Cosmo/Neutrinos Astro-Neutrino 9


Daniele Montanino (Università del Salento & INFN, Lecce)


Recently it has been pointed out that a cosmic background of relativistic axion-like particles (ALPs) would be produced by the primordial decays of heavy fields(moduli) in the post-inflation epoch, contributing to the extra-radiation content in the Universe today. Primordial magnetic fields would trigger conversions of these ALPs into sub-MeV photons during the dark ages. This photon flux would produce an early reionization of the Universe, leaving a significant imprint on the total optical depth to recombination τ. Using the current measurement of τ and the limit on the extra-radiation content ΔNeff by the Planck experiment we put a strong bound on the ALP-photon conversions.

Primary author

Daniele Montanino (Università del Salento & INFN, Lecce)


Dr. Alessandro Mirizzi (Università di Bari & INFN, Bari) Mr. Carmelo Evoli (Laboratori nazionali del Gran Sasso) Dr. Matteo Leo (Durham University - Institute for Particle Physics Phenomenology)

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