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Cosmological Constraints on B-L Violation

This is a review of the cosmological bounds on $B-L$ violating interactions, and the loopholes in the argument that gives these constraints. If one assumes that the baryon asymmetry we observe today was present above the electroweak phase transition in equilibrium with the non-perturbative $B+L$ vio...

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Autor principal: Davidson, Sacha
Lenguaje:eng
Publicado: 1999
Materias:
Acceso en línea:http://cds.cern.ch/record/363283
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author Davidson, Sacha
author_facet Davidson, Sacha
author_sort Davidson, Sacha
collection CERN
description This is a review of the cosmological bounds on $B-L$ violating interactions, and the loopholes in the argument that gives these constraints. If one assumes that the baryon asymmetry we observe today was present above the electroweak phase transition in equilibrium with the non-perturbative $B+L$ violating processes, then interactions that violate all three of ${B/3 - L_i}$ cannot simultaneously be in equilibrium. Otherwise the baryon asymmetry would be washed out. Therefore violation of at least one of the $B/3 - L_i$ must be small. This argument can be evaded by not having the observed baryon asymmetry present in the thermal bath (for instance, make it at the electroweak phase transition), by using a non-standard cosmological model, or possibly by some mass effects in models where the difference between lepton flavour asymmetries is conserved.
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institution Organización Europea para la Investigación Nuclear
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publishDate 1999
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spelling cern-3632832023-03-14T19:52:14Zhttp://cds.cern.ch/record/363283engDavidson, SachaCosmological Constraints on B-L ViolationParticle Physics - PhenomenologyThis is a review of the cosmological bounds on $B-L$ violating interactions, and the loopholes in the argument that gives these constraints. If one assumes that the baryon asymmetry we observe today was present above the electroweak phase transition in equilibrium with the non-perturbative $B+L$ violating processes, then interactions that violate all three of ${B/3 - L_i}$ cannot simultaneously be in equilibrium. Otherwise the baryon asymmetry would be washed out. Therefore violation of at least one of the $B/3 - L_i$ must be small. This argument can be evaded by not having the observed baryon asymmetry present in the thermal bath (for instance, make it at the electroweak phase transition), by using a non-standard cosmological model, or possibly by some mass effects in models where the difference between lepton flavour asymmetries is conserved.This is a review of the cosmological bounds on $B-L$ violating interactions, and the loopholes in the argument that gives these constraints. If one assumes that the baryon asymmetry we observe today was present above the electroweak phase transition in equilibrium with the non-perturbative $B+L$ violating processes, then interactions that violate all three of ${B/3 - L_i}$ cannot simultaneously be in equilibrium. Otherwise the baryon asymmetry would be washed out. Therefore violation of at least one of the $B/3 - L_i$ must be small. This argument can be evaded by not having the observed baryon asymmetry present in the thermal bath (for instance, make it at the electroweak phase transition), by using a non-standard cosmological model, or possibly by some mass effects in models where the difference between lepton flavour asymmetries is conserved.hep-ph/9808427CERN-TH-98-284oai:cds.cern.ch:3632831999
spellingShingle Particle Physics - Phenomenology
Davidson, Sacha
Cosmological Constraints on B-L Violation
title Cosmological Constraints on B-L Violation
title_full Cosmological Constraints on B-L Violation
title_fullStr Cosmological Constraints on B-L Violation
title_full_unstemmed Cosmological Constraints on B-L Violation
title_short Cosmological Constraints on B-L Violation
title_sort cosmological constraints on b-l violation
topic Particle Physics - Phenomenology
url http://cds.cern.ch/record/363283
work_keys_str_mv AT davidsonsacha cosmologicalconstraintsonblviolation