论文标题
宇宙气泡扩张的流体动力反应力
Hydrodynamic backreaction force of cosmological bubble expansion
论文作者
论文摘要
作为对早期宇宙中粒子物理的标准模型以外的新物理学的有希望的探针，从宇宙学一阶相变的随机引力波背景的预测很大程度上依赖于气泡壁速度由气泡扩张动力学确定。气泡膨胀动力学由从有效电势差异的驱动力与来自温度跳跃和跨气泡壁的不平衡效应引起的热力和摩擦力的逆向力之间的竞争控制。 In this paper, we propose a hydrodynamic evaluation on this total backreaction force for a non-runaway steady-state bubble expansion, which, after evaluated at the wall interface, exactly reproduces the pressure difference $Δ_\mathrm{wall}[(\barγ^2-1)w]$ obtained previously from the junction condition of the total energy-momentum tensor at the wall interface, where $w$ is the enthalpy and $ \barγ\ equiv（1- \ bar {v}^2）^{ - 1/2} $是壁挂式流体速度$ \ bar {v} $的lorentz因子。
As a promising probe for the new physics beyond the standard model of particle physics in the early Universe, the predictions for the stochastic gravitational wave background from a cosmological first-order phase transition heavily rely on the bubble wall velocity determined by the bubble expansion dynamics. The bubble expansion dynamics is governed by the competition between the driving force from the effective potential difference and the backreaction force from a sum of the thermal force and friction force induced by the temperature jumping and out-of-equilibrium effects across the bubble wall, respectively. In this paper, we propose a hydrodynamic evaluation on this total backreaction force for a non-runaway steady-state bubble expansion, which, after evaluated at the wall interface, exactly reproduces the pressure difference $Δ_\mathrm{wall}[(\barγ^2-1)w]$ obtained previously from the junction condition of the total energy-momentum tensor at the wall interface, where $w$ is the enthalpy and $\barγ\equiv(1-\bar{v}^2)^{-1/2}$ is the Lorentz factor of the wall-frame fluid velocity $\bar{v}$.
