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<p>A precise determination of the bubble wall velocity v<sub><i>w</i></sub> is crucial for making accurate predictions of the baryon asymmetry and gravitational wave (GW) signals in models of electroweak baryogenesis (EWBG). Working in the local thermal equilibrium approximation, we exploit entropy conservation to present efficient algorithms for computing <i>v</i><sub><i>w</i></sub>, significantly streamlining the calculation. We then explore the parameter dependencies of <i>v</i><sub><i>w</i></sub>, focusing on two sample models capable of enabling a strong first-order electroweak phase transition: a ℤ<sub>2</sub>-symmetric singlet extension of the SM, and a model for baryogenesis with CP violation in the dark sector. We study correlations among <i>v</i><sub><i>w</i></sub> and the two common measures of phase transition strength, <i>α</i><sub><i>n</i></sub> and <i>v</i><sub><i>n</i></sub>/<i>T</i><sub><i>n</i></sub>. Interestingly, we find a relatively model-insensitive relationship between v<sub><i>n</i></sub>/<i>T</i><sub><i>n</i></sub> and <i>α</i><sub><i>n</i></sub>. We also observe an upper bound on <i>α</i><sub><i>n</i></sub> for the deflagration/hybrid wall profiles naturally compatible with EWBG, the exact value for which varies between models, significantly impacting the strength of the GW signals. In summary, our work provides a framework for exploring the feasibility of EWBG models in light of future GW signals.</p>

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The discriminant power of bubble wall velocities: gravitational waves and electroweak baryogenesis

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月23日

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  • Marcela Carena,
  • Aurora Ireland,
  • Tong Ou,
  • Isaac R. Wang

摘要

A precise determination of the bubble wall velocity vw is crucial for making accurate predictions of the baryon asymmetry and gravitational wave (GW) signals in models of electroweak baryogenesis (EWBG). Working in the local thermal equilibrium approximation, we exploit entropy conservation to present efficient algorithms for computing vw, significantly streamlining the calculation. We then explore the parameter dependencies of vw, focusing on two sample models capable of enabling a strong first-order electroweak phase transition: a ℤ2-symmetric singlet extension of the SM, and a model for baryogenesis with CP violation in the dark sector. We study correlations among vw and the two common measures of phase transition strength, αn and vn/Tn. Interestingly, we find a relatively model-insensitive relationship between vn/Tn and αn. We also observe an upper bound on αn for the deflagration/hybrid wall profiles naturally compatible with EWBG, the exact value for which varies between models, significantly impacting the strength of the GW signals. In summary, our work provides a framework for exploring the feasibility of EWBG models in light of future GW signals.