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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-1161
DTSTART:20080411T193000Z
DTEND:20080411T203000Z
DTSTAMP:20260423T041233Z
LAST-MODIFIED:20080403T141254Z
LOCATION:5280 Chamberlin
SUMMARY:Dark-matter sterile neutrinos from decays of a gauge-singlet H
 iggs\, NPAC (Nuclear/Particle/Astro/Cosmo) Forum\, Kalliopi Petraki\, 
 UCLA
DESCRIPTION:Sterile neutrinos are usually introduced to explain the ma
 sses of active neutrinos. If one of these fermions has mass of several
  keV\, it can also account for the cosmological dark matter. The same 
 particle can explain the observed velocities of pulsars\, speed up the
  formation of the first stars and stir up supernova explosions. I will
  describe a mechanism for sterile neutrino production that involves a 
 minimal extension of the Higgs sector by a gauge-singlet scalar. The r
 elic abundance of sterile neutrinos is produced from decays of the sin
 glet Higgs and does not depend on their mixing angle. The resulting da
 rk matter is colder than the warm dark matter produced in neutrino osc
 illations. I will discuss the small-scale structure formation properti
 es of these neutrinos and show that they comply with current observati
 ons. The presence of the gauge singlet in the Higgs sector has importa
 nt implications for the electroweak phase transition\, baryogenesis\, 
 and the upcoming experiments at the LHC.
URL:https://www.physics.wisc.edu/events/?id=1161
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