Cosmology of an Axion-Like Majoron
Antonio J. Cuesta, Mario E. G\'omez, Jos\'e I. Illana, Manuel Masip

TL;DR
This paper introduces an axion-like majoron model with specific cosmological effects, including contributions to effective neutrino species and potential resolution of the Hubble tension, while avoiding strong experimental bounds.
Contribution
It presents a novel singlet majoron model with inverse seesaw mechanism, detailing its cosmological evolution and implications for the Hubble tension and structure formation.
Findings
Majoron mass ~0.5 eV with specific couplings
Contributes ΔN_eff=0.85 near recombination
Potential to relax the Hubble tension to H0=71.4 km/s/Mpc
Abstract
We propose a singlet majoron model that defines an inverse seesaw mechanism in the sector. The majoron has a mass eV and a coupling to the lepton similar to the one to neutrinos. In the early universe it is initially in thermal equilibrium, then it decouples at GeV and contributes with just during BBN. At keV (final stages of BBN) a primordial magnetic field induces resonant oscillations that transfer 6% of the photon energy into majorons, implying and a 4.7% increase in the baryon to photon ratio. At the majoron enters in thermal contact with the heaviest neutrino and it finally decays into pairs near recombination, setting . The boost in the expansion rate at later times may relax the…
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