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On the wall velocity dependence of electroweak baryogenesis

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arxiv 2106.06547 v2 pith:4BZBIP7E submitted 2021-06-11 hep-ph astro-ph.CO

classification hep-phastro-ph.CO
keywords baryogenesiselectroweakansatzdistributionfirstfluidhigherorder
verification ladder T0 review T1 audit T2 compute T3 formal
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We re-evaluate the status of supersonic electroweak baryogenesis using a generalized fluid Ansatz for the non-equilibrium distribution functions. Instead of truncating the expansion to first order in momentum, we allow for higher order terms as well, including up to 21 fluctuations. The collision terms are computed analytically at leading-log accuracy. We also point out inconsistencies in the standard treatments of transport in electroweak baryogenesis, arguing that one cannot do without specifying an Ansatz for the distribution function. We present the first analysis of baryogenesis using the fluid approximation to higher orders. Our results support the recent findings that baryogenesis may indeed be possible even in the presence of supersonic wall velocities.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Benchmarking wall velocities in cosmological phase transitions: Fluid Ansatz and WallGo

    astro-ph.CO 2026-07 conditional novelty 6.0 of 10

    The fluid-Ansatz and WallGo methods agree for mild phase transitions but diverge by tens of percent for strong ones, where the semi-classical approximation itself may break down.

  2. Thermal Masses and Bubble-Wall Friction in Cosmological Phase Transitions

    hep-ph 2026-07 conditional novelty 6.0 of 10

    Including thermal masses in both the Boltzmann source and collision terms removes the infrared gauge-boson enhancement, making W-boson friction subleading in the singlet-extended Standard Model.

  3. DMRadio-Core: A new approach for GUT-scale axion searches

    hep-ex 2026-04 unverdicted novelty 6.0 of 10

    Electroweak-symmetric domain walls produce the observed baryon asymmetry when CP-odd sources and the hierarchy of wall, source, and diffusion lengths suppress face-to-face cancellation.

  4. Cosmological phase transitions from the functional measure

    hep-ph 2025-02 conditional novelty 6.0 of 10

    In the minimal modified functional measure model, a logarithmic scalar-potential correction can make the electroweak transition strongly first order, and future gravitational-wave observatories could probe the Higgs t...

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