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SUMMARY:Topical Seminar: Solving the riddle: Visible in the laboratory and
  invisible in cosmology: Decaying sterile neutrinos
DTSTART;VALUE=DATE-TIME:20231218T110000Z
DTEND;VALUE=DATE-TIME:20231218T130000Z
DTSTAMP;VALUE=DATE-TIME:20260515T141444Z
UID:indico-event-7364@indico.ific.uv.es
DESCRIPTION:The expansion history and thermal physical process that happen
 ed in the early Universe before big bang nucleosynthesis (BBN) remains rel
 atively unconstrained by observations. Low reheating temperature universes
  with\nnormalcy temperatures of T_RH~2MeV  remain consistent with primord
 ial nucleosynthesis\, and accommodate several new physics scenarios that w
 ould normally be constrained by high-temperature reheating models\, includ
 ing massive sterile neutrinos. We explore such scenarios? production of ke
 V\nscale sterile neutrinos and their resulting constraints from cosmologic
 al observations. The parameter space for massive sterile neutrinos is much
  less constrained than in high-T_RH  thermal histories\, though several c
 osmological constraints remain. Such parameter space is the target of seve
 ral current and upcoming laboratory experiments such as TRISTAN (KATRIN)\,
  HUNTER\, MAGNETO- ?. Cosmological constraints remain stringent for stable
  keV-scale sterile neutrinos. However\, we show that sterile neutrinos wit
 h a dark decay to radiation through a Z' or a new scalar are largely uncon
 strained by cosmology. In addition\, this mechanism of sterile neutrinos w
 ith large mixing may provide a solution to the Hubble tension.\nWe find th
 at keV-scale sterile neutrinos are therefore one of the best probes of the
  untested pre-BBN era in the early Universe and could be seen in upcoming 
 laboratory experiments.\n\nhttps://indico.ific.uv.es/event/7364/
LOCATION:Universe 1001-Primera-1-1-1 - Paterna. Seminario
URL:https://indico.ific.uv.es/event/7364/
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