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

TY - CHAP

T1 - Neutrinos in the early universe, kalb-ramond torsion and matter-antimatter asymmetry

AU - Mavromatos, Nick E.

AU - Sarkar, Sarben

PY - 2014/4/29

Y1 - 2014/4/29

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84901419811&partnerID=8YFLogxK

U2 - 10.1051/epjconf/20147100085

DO - 10.1051/epjconf/20147100085

M3 - Conference paper

AN - SCOPUS:84901419811

VL - 71

BT - EPJ Web of Conferences

PB - EDP Sciences

T2 - 2nd International Conference on New Frontiers in Physics, ICNFP 2013

Y2 - 28 August 2013 through 5 September 2013

ER -