Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-10-26
Mod.Phys.Lett. A21 (2006) 399-408
Physics
High Energy Physics
High Energy Physics - Phenomenology
9 RevTeX pages, no figure; Version to appear in Modern Physics Letters A
Scientific paper
10.1142/S0217732306019542
It is well known that when a fermion propagates in curved space-time, its spin couples to the curvature of background space-time. We propose that this interaction for neutrinos propagating in early curved universe could give rise to a new set of dispersion relations and then neutrino asymmetry at equilibrium. We demonstrate this with the Bianchi models which describe the homogeneous but anisotropic and axially symmetric universe. If the lepton number violating processes freeze out at 10^{-37} second when temperature T ~ 10^{15} GeV, neutrino asymmetry of the order of 10^{-10} can be generated. A net baryon asymmetry of the same magnitude can thus be generated from this lepton asymmetry either by a GUT B-L symmetry or by the electro-week sphaleron processes which have B+L symmetry.
Dadhich Naresh
Debnath Ujjal
Mukhopadhyay Banibrata
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