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The cosmological evolution of standard model Yukawa couplings may have majorimplications for baryogenesis. In particular, as highlighted recently, the CKMmatrix alone could be the source of CP-violation during electroweakbaryogenesis provided that the Yukawa couplings were large and varied duringthe electroweak phase transition. We provide a natural realisation of this ideain the context of Randall-Sundrum models and show that the geometrical warpedapproach to the fermion mass hierarchy may naturally display the desiredcosmological dynamics. The key ingredient is the coupling of theGoldberger-Wise scalar, responsible for the IR brane stabilisation, to the bulkfermions, which modifies the fermionic profiles. This also helps alleviatingthe usually tight constraints from CP-violation in Randall-Sundrum scenarios.We study how the Yukawa couplings vary during the stabilisation of theRandall-Sundrum geometry and can thus induce large CP-violation during theelectroweak phase transition. Using holography, we discuss the 4Dinterpretation of this dynamical interplay between flavour and electroweaksymmetry breaking.

Cosmological evolution of Yukawa couplings: the 5D perspective