Electroweak Baryogenesis with BARYONET: Theory and Applications

by Dr GIULIO BARNI (IFT-UAM/CSIC Madrid)

Wednesday 11 Mar 2026, 11:30 → 12:30 Europe/Zurich

4/2-011 - TH common room (CERN)

I will give a focused review of electroweak baryogenesis (EWBG), a classic and well-established mechanism for generating the baryon asymmetry of the Universe, emphasizing how the field has converged to its modern quantitative formulation. Starting from the semiclassical WKB picture—where spacetime-dependent complex masses across an expanding bubble wall induce CP-violating forces—I will outline the current set of transport equations for chemical potentials and velocity perturbations and how they connect, through sphaleron processes, to a prediction for the baryon asymmetry.

Everything I will present can be found in BARYONET, an open-source code that implements this state-of-the-art EWBG pipeline end-to-end with extensive numerical cross-checks against the main formalisms in the literature and multiple internal consistency tests. Finally, I will show a few representative applications to standard benchmark models (including singlet extensions, Two-Higgs-Doublet Models, and Higgs–$\phi^6$ scenarios), illustrating how BARYONET can be used to map viable regions of parameter space and to study the interplay between baryogenesis requirements and phenomenological constraints.

This seminar will be in the blackboard.

BARYONET_CERN_BSM_COSMO_2026_Giulio_Barni.pdf