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SUMMARY:Intimate relationship between sterile neutrino Dark Matter and ext
 ra radiation in the early Universe
DTSTART;VALUE=DATE-TIME:20210831T154500Z
DTEND;VALUE=DATE-TIME:20210831T160000Z
DTSTAMP;VALUE=DATE-TIME:20260411T181638Z
UID:indico-contribution-15679@indico.ific.uv.es
DESCRIPTION:Speakers: Manibrata Sen (UC\, Berkeley)\nkeV-scale gauge-singl
 et fermions\, allowed to mix with the active neutrinos\, are elegant dark 
 matter (DM) candidates. They are produced in the early universe via the Do
 delson-Widrow mechanism and can be detected as they decay very slowly\, em
 itting X-rays. In the absence of new physics\, this hypothesis is virtuall
 y ruled out by astrophysical observations. In this talk\, I will demonstra
 te that new interactions among the active neutrinos allow these sterile ne
 utrinos to make up all the DM while safely evading all current experimenta
 l bounds. Neutrino interactions mediated by a sub-MeV scalar can also lead
  a lower bound on the amount of extra radiation in the early Universe. Suc
 h models can\, therefore\, receive strong constraints from next generation
  cosmology experiments\, like CMB-S4\n\nhttps://indico.ific.uv.es/event/61
 78/contributions/15679/
LOCATION:
URL:https://indico.ific.uv.es/event/6178/contributions/15679/
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