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Resummation and cancellation of the VIA source in electroweak baryogenesis

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arxiv 2206.01120 v2 pith:CV7K5AVI submitted 2022-06-02 hep-ph astro-ph.CO

classification hep-phastro-ph.CO
keywords sourceequationsapproximationbaryogenesiscancellationelectroweakresummedvev-insertion
verification ladder T0 review T1 audit T2 compute T3 formal
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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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Cited by 3 Pith papers

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  1. An Effective Sphaleron Awakens

    hep-ph 2025-06 conditional novelty 7.0 of 10

    A consistent 3D EFT computation of the Higgs phase sphaleron rate yields universal baryon preservation bounds x ≈ 0.025 (strong) and x ≈ 0.036 (weak), and shows two-loop corrections eliminate strong one-step transitio...

  2. Real-Time Simulation of Asymmetry Generation in Fermion-Bubble Collisions

    hep-ph 2024-12 conditional novelty 6.0 of 10

    Real-time tensor-network scattering of fermions off a complex-mass bubble wall in 1+1D yields a nonzero C asymmetry, captured by new magnitude and phase observables.

  3. The First Particles

    hep-ph 2025-01 unverdicted

    No new result: the paper is an expository review of reheating, electroweak baryogenesis, and leptogenesis in early universe cosmology.

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