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SUMMARY:Neutrinos in Cosmology
DTSTART;VALUE=DATE-TIME:20020508T160000Z
DTEND;VALUE=DATE-TIME:20020508T170000Z
DTSTAMP;VALUE=DATE-TIME:20261109T033507Z
UID:indico-event-1264@indico.ific.uv.es
DESCRIPTION:We review the role of massive neutrinos in cosmology. At prese
 nt the most restrictive limits on the overall neutrino mass scale comes fr
 om cosmological structure formation arguments in conjunction with large-sc
 ale galaxy surveys. Conversely\, the cosmic neutrino mass density can be c
 onstrained by laboratory measurements of the neutrino mass\, for example i
 n the KATRIN experiment\, if the cosmic number density of neutrinos were k
 nown. However\, it depends on the unknown cosmic neutrino degeneracy param
 eters. We show that neutrino oscillations effectively lead to chemical equ
 ilibrium before big-bang nucleosynthesis (BBN) if the favored LMA solution
  of the solar neutrino problem applies. It is supported by the recent SNO 
 results. In this case the restrictive BBN limit on the chemical potential 
 of the electron neutrino applies to all flavors and the cosmic neutrino de
 nsity is tightly constrained to be within 1% of its standard value. The pr
 imordial neutrino oscillations involve fascinating non-linear effects due 
 to the neutrino self-potential which lead to a synchronization of the osci
 llations of different modes. It is fascinating that solving the solar neut
 rino problem with the LMA solution indirectly provides a number count of t
 he cosmic neutrino sea. We finally also mention leptogenesis as an importa
 nt cosmological role for Majorana neutrino masses in the experimentally fa
 vored regime.\n\nhttps://indico.ific.uv.es/event/1264/
LOCATION:Edf. Institutos de Investigación Sala Seminarios IFIC
URL:https://indico.ific.uv.es/event/1264/
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