Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2001-05-27
Phys.Lett. B520 (2001) 152-158
Physics
High Energy Physics
High Energy Physics - Phenomenology
Improved by including constraints imposed by gravitino decay, new references added, corrections and changes made. Accepted for
Scientific paper
10.1016/S0370-2693(01)01123-6
Adjoint supermultiplets (1,3,0) and (8,1,0) modify the evolution of gauge couplings. If the unification of gauge couplings occurs at the string scale, their masses are fixed at around $10^{13}$ GeV. This scale coincides with expected gaugino condensation scale in the hidden sector $M_{string}^{2/3} m^{1/3}_{3/2} \sim 10^{13}$ GeV. We show how neutrino masses arise in this unified model which naturally explain the present atmospheric and solar neutrino data. The out-of-equilibrium decay of the superfield (1,3,0) at $10^{13}$ GeV may also lead to a lepton asymmetry which then gets converted into the present observed baryon asymmetry of the Universe.
Brahmachari Biswajoy
Ma Ernest
Sarkar Utpal
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