On the possibility of tree-level leptogenesis from Kalb–Ramond torsion background

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The effect of torsion in theories of quantum gravity is known to be well described by an axion-like field which couples to matter as well as to gravitation and radiation gauge fields. In this note we consider a particular kind of torsion, arising from the Kalb-Ramond antisymmetric tensor field that...

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Detalles Bibliográficos
Autores principales: de Cesare, M., Mavromatos, Nick E., Sarkar, Sarben
Lenguaje:eng
Publicado: 2014
Materias:
Particle Physics - Phenomenology
Acceso en línea:https://dx.doi.org/10.1140/epjc/s10052-015-3731-z
http://cds.cern.ch/record/1978517
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author de Cesare, M.
Mavromatos, Nick E.
Sarkar, Sarben
author_facet de Cesare, M.
Mavromatos, Nick E.
Sarkar, Sarben
author_sort de Cesare, M.
collection CERN
description The effect of torsion in theories of quantum gravity is known to be well described by an axion-like field which couples to matter as well as to gravitation and radiation gauge fields. In this note we consider a particular kind of torsion, arising from the Kalb-Ramond antisymmetric tensor field that appears in the gravitational multiplet of string theory. We investigate the implications for leptogenesis. It is shown that leptogenesis can occur even at tree-level and with only one generation of right-handed Majorana neutrinos, due to CP and CPT violation introduced by the background geometry.
id cern-1978517
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2014
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spelling cern-19785172022-08-10T13:00:00Zdoi:10.1140/epjc/s10052-015-3731-zhttp://cds.cern.ch/record/1978517engde Cesare, M.Mavromatos, Nick E.Sarkar, SarbenOn the possibility of tree-level leptogenesis from Kalb–Ramond torsion backgroundParticle Physics - PhenomenologyThe effect of torsion in theories of quantum gravity is known to be well described by an axion-like field which couples to matter as well as to gravitation and radiation gauge fields. In this note we consider a particular kind of torsion, arising from the Kalb-Ramond antisymmetric tensor field that appears in the gravitational multiplet of string theory. We investigate the implications for leptogenesis. It is shown that leptogenesis can occur even at tree-level and with only one generation of right-handed Majorana neutrinos, due to CP and CPT violation introduced by the background geometry.In this work we consider a phenomenological model for leptogenesis in the context of a Standard Model Extension with an axial-like background coupling to fermions that violates both Lorentz and CPT symmetries. The latter is motivated by a background geometry of the early Universe involving a particular kind of torsion, arising from the Kalb–Ramond antisymmetric tensor field which appears in the gravitational multiplet of string theory, although we do not restrict ourselves to this framework. It is shown that leptogenesis can occur even at tree level and with only one generation of right-handed heavy Majorana neutrinos, due to ${ CP }$ and CPT violation introduced by the background geometry. Important issues for the model, including (a) its compatibility with a conventional-like cosmology and (b) current-era phenomenology (characterised by very stringent bounds on the allowed amount of torsion) are pointed out, and potential ways of resolving them, within the framework of string-theory models, are discussed.The effect of torsion in theories of quantum gravity is known to be well described by an axion-like field which couples to matter as well as to gravitation and radiation gauge fields. In this note we consider a particular kind of torsion, arising from the Kalb-Ramond antisymmetric tensor field that appears in the gravitational multiplet of string theory. We investigate the implications for leptogenesis. It is shown that leptogenesis can occur even at tree-level and with only one generation of right-handed Majorana neutrinos, due to CP and CPT violation introduced by the background geometry.arXiv:1412.7077KCL-PH-TH-2014-30LCTS-2014-43KCL-PH-TH-2014-30LCTS-2014-43oai:cds.cern.ch:19785172014-12-22
spellingShingle Particle Physics - Phenomenology
de Cesare, M.
Mavromatos, Nick E.
Sarkar, Sarben
On the possibility of tree-level leptogenesis from Kalb–Ramond torsion background
title On the possibility of tree-level leptogenesis from Kalb–Ramond torsion background
title_full On the possibility of tree-level leptogenesis from Kalb–Ramond torsion background
title_fullStr On the possibility of tree-level leptogenesis from Kalb–Ramond torsion background
title_full_unstemmed On the possibility of tree-level leptogenesis from Kalb–Ramond torsion background
title_short On the possibility of tree-level leptogenesis from Kalb–Ramond torsion background
title_sort on the possibility of tree-level leptogenesis from kalb–ramond torsion background
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1140/epjc/s10052-015-3731-z
http://cds.cern.ch/record/1978517
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AT mavromatosnicke onthepossibilityoftreelevelleptogenesisfromkalbramondtorsionbackground
AT sarkarsarben onthepossibilityoftreelevelleptogenesisfromkalbramondtorsionbackground

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