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This Week at Physics

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Event Number 3480

  Thursday, September 25th, 2014

NPAC (Nuclear/Particle/Astro/Cosmo) Forum
PeV neutrinos from right handed neutrino dark matter
Time: 2:30 pm
Place: 5280 Chamberlin Hall
Speaker: Ryosuke Sato, KEK
Abstract: The Standard Model of particle physics fails to explain the important
pieces in the standard cosmology, such as inflation, baryogenesis, and
dark matter of the Universe. We consider the possibility that the
sector to generate small neutrino masses is responsible for all of
them; the inflation is driven by the Higgs field to break B−L gauge
symmetry which provides the Majorana masses to the right-handed
neutrinos, and the reheating process by the decay of the B−L Higgs
boson supplies the second lightest right-handed neutrinos whose CP
violating decays produce B−L asymmetry, a la, leptogenesis. The
lightest right-handed neutrinos are also produced by the reheating
process, and remain today as the dark matter of the Universe. In the
minimal model of the inflaton potential, one can set the parameter of
the potential by the data from CMB observations. In such a scenario,
the mass of the dark matter particle is predicted to be of the order
of PeV. We find that the decay of the PeV right-handed neutrinos can
explain the high-energy neutrino flux observed at the IceCube
experiments if the lifetime is of the order of 10^28 s.
Host: Ran Lu
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