CPT and lepton number violation in the neutrino sector: Modified mass matrix and oscillation due to gravity

Sinha, Monika and Mukhopadhyay, Banibrata (2008) CPT and lepton number violation in the neutrino sector: Modified mass matrix and oscillation due to gravity. In: Physical Review D, 77 (2). 025003-1-025003-12.

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Abstract

We study the consequences of CPT and lepton number violation in the neutrino sector. For CPT violation we take gravity with which neutrino and antineutrino couple differently. Gravity mixes neutrino and antineutrino in an unequal ratio to give two mass eigenstates. Lepton number violation interaction together with CPT violation gives rise to neutrino-antineutrino oscillation. Subsequently, we study the neutrino flavor mixing and oscillation under the influence of gravity. It is found that gravity changes flavor oscillation significantly which influences the relative abundance of different flavors in present universe. We show that the neutrinoless double beta decay rate is modified due to the presence of gravity—the origin of CPT violation, as the mass of the flavor state is modified.

Item Type:	Journal Article
Publication:	Physical Review D
Publisher:	American Physical Society
Additional Information:	Copyright of this article belongs to American Physical Society.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	07 Mar 2008
Last Modified:	19 Sep 2010 04:41
URI:	http://eprints.iisc.ac.in/id/eprint/12516

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