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DTSTART;TZID=Europe/Madrid:20251009T150000
DTEND;TZID=Europe/Madrid:20251009T160000
DTSTAMP:20260721T101535
CREATED:20250817T090853Z
LAST-MODIFIED:20251218T085638Z
UID:21513-1760022000-1760025600@www.ift.uam-csic.es
SUMMARY:Large neutrino mass in cosmology and keV sterile neutrino dark matter from a dark sector
DESCRIPTION:Speaker: Thomas Schwetz from Karlsruhe Institute of Technology (KIT)\n\n\n\n\n\nVenue&Time: Red Room / 3:00 PM \n\nAbstract:\nRecent results from cosmology place sever upper bounds on the sum of neutrino masses\, starting to be in conflict with lower bounds from neutrino oscillations. If this neutrino tension persists\, it may indicate new physics in cosmology and/or neutrino physics. After a brief review of the present state\, I discuss a new physics scenario able to explain this tension. It is based on an extended seesaw model for neutrino mass\, including a number of massless neutrinos acting as dark radiation\, as well as a keV state as a dark matter candidate. The dark sector is brought into equilibrium with neutrinos between BBN and recombination. This scenario predicts a slight increase in the effective number of neutrino species Neff at recombination\, potentially detectable byfuture CMB missions.
URL:https://www.ift.uam-csic.es/event/seminar-thomas-schwetz/
LOCATION:IFT Seminar Room/Red Room\, Instituto de Física Teórica (IFT) -C. Nicolás Cabrera\, 13-15\, Fuencarral-El Pardo\, Madrid\, 28049\,\, Spain
CATEGORIES:Scientific activities,Seminars
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