PoS - Proceedings of Science
Volume 454 - 1st General Meeting and 1st Training School of the COST Action COSMIC WISPers (COSMICWISPers) - Wg2
Photon to axion conversion during BBN
M. Masip
Full text: pdf
Pre-published on: February 21, 2024
Published on: April 23, 2024
We discuss the cosmology of an axion-like particle associated to the generation of neutrino masses: an axion-like majoron or ALM. In particular, we consider the possibility that at the end of BBN a fraction of the CMB photons converts into majorons that then decay into neutrinos during recombination. We show that this could define an interesting variation of the $\Lambda$CDM model where (i) the increase in $N_{eff}$ relaxes the so called $H_0$ tension; (ii) the larger baryon to photon ratio after BBN provides a better agreement of the deuterium abundance with CMB observables; and (iii) the sudden drop in
the CMB temperature interrupts the synthesis of lithium and beryllium alleviating the so called lithium problem.
DOI: https://doi.org/10.22323/1.454.0017
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