Cosmological evolution of Yukawa couplings: the 5D perspective

A bstract The cosmological evolution of standard model Yukawa couplings may have major implications for baryogenesis. In particular, as highlighted recently, the CKM matrix alone could be the source of CP -violation during electroweak baryogenesis provided that the Yukawa couplings were large and va...

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Bibliographic Details
Published in:The journal of high energy physics 2017-05, Vol.2017 (5), p.1-39, Article 77
Main Authors: von Harling, Benedict, Servant, Géraldine
Format: Article
Language:English
Subjects:
Astronomical models
Broken symmetry
Classical and Quantum Gravitation
Cosmology
Cosmology of Theories beyond the SM
Couplings
CP violation
Elementary Particles
Evolution
Fermions
Field Theories in Higher Dimensions
High energy physics
Holography
Phase transitions
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Quantum Physics
Quark Masses and SM Parameters
Regular Article - Theoretical Physics
Relativity Theory
String Theory
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Summary:A bstract The cosmological evolution of standard model Yukawa couplings may have major implications for baryogenesis. In particular, as highlighted recently, the CKM matrix alone could be the source of CP -violation during electroweak baryogenesis provided that the Yukawa couplings were large and varied during the electroweak phase transition. We provide a natural realisation of this idea in the context of Randall-Sundrum models and show that the geometrical warped approach to the fermion mass hierarchy may naturally display the desired cosmological dynamics. The key ingredient is the coupling of the Goldberger-Wise scalar, responsible for the IR brane stabilisation, to the bulk fermions, which modifies the fermionic profiles. This also helps alleviating the usually tight constraints from CP -violation in Randall-Sundrum scenarios. We study how the Yukawa couplings vary during the stabilisation of the Randall-Sundrum geometry and can thus induce large CP -violation during the electroweak phase transition. Using holography, we discuss the 4D interpretation of this dynamical interplay between flavour and electroweak symmetry breaking.
ISSN:1029-8479
1029-8479
DOI:10.1007/JHEP05(2017)077