Possible Neutrino-Antineutrino Oscillation Under Gravity and its Consequences

Mukhopadhyay, Banibrata (2007) Possible Neutrino-Antineutrino Oscillation Under Gravity and its Consequences. In: 11th Marcel Grossmann Meeting, Berlin, 15 Jan 2007, Berlin.

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Abstract

We show that under gravity the effective masses for neutrino and antineutrino are different which opens a possible window of neutrino-antineutrino oscillation even if the rest masses of the corresponding eigenstates are same. This is due to CPT violation and 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. In early universe, in presence of various lepton number violating processes, this oscillation might lead to neutrino-antineutrino asymmetry which resulted baryogenesis from the B-L symmetry by electro-weak sphaleron processes. On the other hand, for Majorana neutrinos, this oscillation is expected to affect the inner edge of neutrino dominated accretion disks around a compact object by influencing the neutrino sphere which controls the accretion dynamics, and then the related type-II supernova evolution and the r-process nucleosynthesis.

Item Type:	Conference Paper
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	21 Oct 2011 05:04
Last Modified:	21 Oct 2011 05:04
URI:	http://eprints.iisc.ac.in/id/eprint/41542

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