18,036 research outputs found
Neutrino coupling to cosmological background: A review on gravitational Baryo/Leptogenesis
In this work we review the theories of origin of matter-antimatter asymmetry
in the Universe. The general conditions for achieving baryogenesis and
leptogenesis in a CPT conserving field theory have been laid down by Sakharov.
In this review we discuss scenarios where a background scalar or gravitational
field spontaneously breaks the CPT symmetry and splits the energy levels
between particles and anti-particles. Baryon or Lepton number violating
processes in proceeding at thermal equilibrium in such backgrounds gives rise
to Baryon or Lepton number asymmetry.Comment: 62 pages, no figures. Invited review to appear in IJMP
Neutrino processes with power law dispersion relations
We compute various processes involving neutrinos in the initial and/or final
state and we assume that neutrinos have energy momentum relation with a general
power law correction due to Lorentz invariance violation.
We find that for the bounds on from direct time of flight
measurement are much more stringent than from constraining the neutrino
Cerenkov decay process.Comment: 13 pages, 1 figure, Title change, replacement matches version
accepted in Phys. Rev.
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