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arXiv · 2206.01120

Resummation and cancellation of the VIA source in electroweak baryogenesis

Marieke Postma·Jorinde van de Vis·Graham White
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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. Interestingly, the non-existence of the source is a result of a cancellation between different terms in the KB equations, and not of a pathology in the vev-insertion approximation itself.

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Marieke Postma, Jorinde van de Vis, Graham White. 2022-06-02. Resummation and cancellation of the VIA source in electroweak baryogenesis. https://doi.org/10.1007/jhep12(2022)121

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