2005/10/31 by Ujjal Debnath, Banibrata Mukhopadhyay, Naresh Dadhich · 1 citation
Physics and Astronomy · #Asymmetry #Baryogenesis #Baryon asymmetry #Cosmology and Gravitation Theories #Electroweak interaction #Lepton #Lepton number #Mathematical physics #Neutrino #Noncommutative and Quantum Gravity Theories #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum mechanics #Spacetime #Sphaleron #Universe #astro-ph #gr-qc #hep-ph
paper · pdf · doi:10.1142/s0217732306019542
published as Mod.Phys.Lett. A21 (2006) 399-408 · 9 RevTeX pages, no figure; Version to appear in Modern Physics Letters A
arxiv created 2005/12/21 · openalex publication_date 2006/02/20 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
It is well known that when a fermion propagates in curved spacetime, its spin couples to the curvature of background spacetime. 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 s 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 electroweak sphaleron processes which have B+L symmetry.