2007/02/10 by Banibrata Mukhopadhyay · 1 citation
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Asymmetry #Baryogenesis #Cosmology and Gravitation Theories #Lepton #Lepton number #MAJORANA #Neutrino #Neutrino Physics Research #Neutrino oscillation #Sphaleron #Sterile neutrino #astro-ph #gr-qc #hep-ph
paper · pdf · doi:10.1088/0264-9381/24/6/004
published as Class.Quant.Grav.24:1433-1442,2007 · 15 pages; Accepted for publication in Classical and Quantum Gravity
arxiv created 2007/02/10 · openalex publication_date 2007/03/06 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We introduce a new effect in the neutrino oscillation phase which shows that the neutrino–antineutrino oscillation is possible under gravity even if the rest masses of the corresponding eigenstates are the same. This is due to CPT violation, and is possible to demonstrate if the neutrino mass eigenstates are expressed as a combination of neutrino and antineutrino eigenstates, as of the neutral kaon system, with the plausible breaking of lepton number conservation. For Majorana neutrinos, this oscillation is expected to significantly affect the inner edge of neutrino-dominated accretion discs around compact objects by influencing the neutrino sphere which controls the accretion dynamics, and then the related type-II supernova evolution and the r-process nucleosynthesis. On the other hand, in the early universe, in the presence of various lepton number violating processes, this oscillation, we argue, might have led to neutrino asymmetry which resulted in baryogenesis from the B–L symmetry by electro-weak sphaleron processes.