Cosmological constraints on thermal relic axions and axion-like particles
Davide Cadamuro, Javier Redondo
TL;DR
This paper reviews existing cosmological bounds on thermal relic axions and axion-like particles and introduces new constraints based on their decay effects on baryon and neutrino densities using recent cosmological data.
Contribution
It provides a comprehensive review of known bounds and proposes novel constraints for decaying axions and ALPs from early universe cosmology.
Findings
New constraints on decaying axions and ALPs from baryon and neutrino dilution.
Updated bounds using WMAP7 and other cosmological data.
Enhanced understanding of axion/ALP parameter space in cosmology.
Abstract
Cosmological precision data can be used to set very strict constraints on Axions and Axion-like particles (ALPs) produced thermally in the big bang. We briefly review the known bounds and propose two new constraints for Axions and ALPs decaying in the early universe, based upon the concomitant dilution of baryon and neutrino densities, using WMAP7 and other cosmological data.
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