Abstract
We re-derive the vev-insertion approximation (VIA) source in electroweak baryogenesis. In contrast to the original derivation, we rely solely on 1-particle-irreducible self-energy diagrams. We solve the Green’s function equations both perturbatively and resummed over all vev-insertions. The VIA source corresponds to the leading order contribution in the gradient expansion of the Kadanoff-Baym (KB) equations. We find that it vanishes both for bosons and fermions, both in the perturbative and in the resummed approach. The non-existence of the source is a result of a cancellation between different terms in the KB equations, and persists after resumming the masses.
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Postma, M., van de Vis, J. & White, G. Resummation and cancellation of the VIA source in electroweak baryogenesis. J. High Energ. Phys. 2022, 121 (2022). https://doi.org/10.1007/JHEP12(2022)121
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DOI: https://doi.org/10.1007/JHEP12(2022)121