Constraining majoron by Big Bang Nucleosynthesis

by Sougata Ganguly (Chungnam National University, Republic of Korea)

Tuesday 16 Jul 2024, 14:30 → 16:00 Europe/Rome

Aula Seminari (Laboratori Nazionali di Frascati)

In this talk, we will discuss the Big Bang nucleosynthesis (BBN) constraint on the majoron in the mass range between $1\,{\rm MeV}$ to $10\,{\rm GeV}$ which dominantly decays into the standard model neutrinos. When the majoron lifetime is shorter than $1\,{\rm sec}$, the injected neutrinos mainly heat up background plasma, which alters the relation between photon temperature and background neutrino temperature. For a lifetime longer than $1\,{\rm sec}$, most of the injected neutrinos directly contribute to the protons-to-neutron conversion. In both cases, deuterium and helium abundances are enhanced, while the constraint from the deuterium is stronger than that from the helium abundance gets decreased as a consequence of additional neutrons, but the parameter range that fits the observed abundance is excluded by the deuterium constraint. We also estimate other cosmological constraints and compare them with the BBN bound.