Neutrinos in the early universe, kalb-ramond torsion and matter-antimatter asymmetry

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Abstract

The generation of a matter-antimatter asymmetry in the universe may be induced by the propagation of fermions in non-trivial, spherically asymmetric (and hence Lorentz violating) gravitational backgrounds. Such backgrounds may characterise the epoch of the early universe. The key point in these models is that the background induces different dispersion relations, hence populations, between fermions and antifermions, and thus CPT Violation (CPTV) appears in thermal equilibrium. Species populations may freeze out leading to leptogenesis and baryogenesis. We consider here a string-inspired scenario, in which the CPTV is associated with a cosmological background with torsion provided by the Kalb-Ramond (KR) antisymemtric tensor field of the string gravitational multiplet. In a four-dimensional space time this field is dual to a pseudoscalar "axionlike" field. The mixing of the KR field with an ordinary axion field can lead to the generation of a Majorana neutrino mass.

Original languageEnglish
Title of host publicationEPJ Web of Conferences
PublisherEDP Sciences
Volume71
DOIs
Publication statusPublished - 29 Apr 2014
Event2nd International Conference on New Frontiers in Physics, ICNFP 2013 - Kolymbari, Crete, Greece
Duration: 28 Aug 20135 Sept 2013

Conference

Conference2nd International Conference on New Frontiers in Physics, ICNFP 2013
Country/TerritoryGreece
CityKolymbari, Crete
Period28/08/20135/09/2013

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