151 research outputs found
Leptogenesis by curvature coupling of heavy neutrinos
We introduce a CP violating coupling between the Ricci curvature and the
heavy right handed neutrinos. This splits the Majorana masses of the left and
the right handed heavy neutrinos. When the heavy neutrinos decay, their decay
rates are different into left and right chirality light neutrinos. A time
varying non-zero Ricci curvature can give rise to a net lepton asymmetry. The
source of a non-zero curvature in a radiation era is the quantum fluctations of
primordial fields.Comment: 13 pages. Accepted for publication in PR
No scale SUGRA SO(10) derived Starobinsky Model of Inflation
We show that a supersymmetric renormalizable theory based on gauge group
SO(10) and Higgs system {\bf {10 210 126
}} with no scale supergravity can lead to a Starobinsky
kind of potential for inflation. Successful inflation is possible in the cases
where the potential during inflation corresponds to , and flipped intermediate symmetry with a suitable choice of superpotential
parameters. The reheating in such a scenario can occur via non perturbative
decay of inflaton i.e. through "preheating". After the end of reheating, when
universe cools down, the finite temperature potential can have a minimum which
corresponds to MSSM.Comment: 6 pages, 2 figures, Replaced with version to appear in Phys Lett
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