151 research outputs found

    Leptogenesis by curvature coupling of heavy neutrinos

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    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

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    We show that a supersymmetric renormalizable theory based on gauge group SO(10) and Higgs system {\bf {10 \oplus 210 \oplus 126 \oplus 126\overline{\bf 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 SU(3)C×SU(2)L×SU(2)R×U(1)BLSU(3)_C \times SU(2)_L \times SU(2)_R \times U(1)_{B-L}, SU(5)×U(1)SU(5)\times U(1) and flipped SU(5)×U(1)SU(5)\times U(1) 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