BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//INFN-LNF - ECPv5.14.2.1//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:INFN-LNF
X-ORIGINAL-URL:https://w3.lnf.infn.it
X-WR-CALDESC:Eventi per INFN-LNF
BEGIN:VTIMEZONE
TZID:Europe/Rome
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20240331T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20241027T010000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20240716T143000
DTEND;TZID=Europe/Rome:20240716T160000
DTSTAMP:20260411T130004
CREATED:20240701T092613Z
LAST-MODIFIED:20240701T092613Z
UID:38083-1721140200-1721145600@w3.lnf.infn.it
SUMMARY:Constraining majoron by Big Bang Nucleosynthesis
DESCRIPTION:Speaker: Sougata Ganguly (Indian Association for the Cultivation of Science) \nIn this talk\, we will discuss the Big Bang nucleosynthesis (BBN) constraint on the majoron in the mass range between to which dominantly decays into the standard model neutrinos. When the majoron lifetime is shorter than\, the injected neutrinos mainly heat up background plasma\, which alters the relation between photon temperature and background neutrino temperature. For a lifetime longer than\, 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.
URL:/event/constraining-majoron-by-big-bang-nucleosynthesis/
LOCATION:Aula Seminari\, Via Enrico Fermi\, 40\, Frascati\, Roma\, 00044\, Italia
CATEGORIES:Seminari teorici
END:VEVENT
END:VCALENDAR