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arXiv 2007.10343hep-ph
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电弱泡壁速度的全阶计算

Towards an all-orders calculation of the electroweak bubble wall velocity

Stefan Hoeche, Jonathan Kozaczuk, Andrew J. Long, Jessica Turner, Yikun Wang

摘要:

我们分析了早期宇宙中一阶电弱相变过程中希格斯凝聚泡的膨胀。粒子与泡壁的相互作用可以伴随着多个软规范玻色子的发射。当在微扰理论中以固定阶数计算时,该过程表现出很大的对数增强,当壁面速度很大时,必须将其恢复到所有阶数。我们执行这两个解析和数值计算在领先的对数精度repetmation。数值模拟是通过在电弱理论的破碎阶段的粒子簇射。这两种方法在10%的水平上是一致的。对于快速移动的墙壁,我们发现对墙壁施加的热压力的缩放是$P\sim γ^2T^4$,独立的粒子质量,这意味着一个显着较慢的终极速度比以前建议。

英文摘要:

We analyze Higgs condensate bubble expansion during a first-order electroweak phase transition in the early Universe. The interaction of particles with the bubble wall can be accompanied by the emission of multiple soft gauge bosons. When computed at fixed order in perturbation theory, this process exhibits large logarithmic enhancements which must be resummed to all orders when the wall velocity is large. We perform this resummation both analytically and numerically at leading logarithmic accuracy. The numerical simulation is achieved by means of a particle shower in the broken phase of the electroweak theory. The two approaches agree to the 10\% level. For fast-moving walls, we find the scaling of the thermal pressure exerted against the wall to be $P\sim γ^2T^4$, independent of the particle masses, implying a significantly slower terminal velocity than previously suggested.

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