论文标题
来自真空一阶相变的重力波II：从薄到厚的壁
Gravitational waves from vacuum first order phase transitions II: from thin to thick walls
论文作者
论文摘要
在真空一阶相变，引力波是由真空气泡的碰撞产生的。这种碰撞的频谱采用了破碎的权力定律的形式。我们考虑了这种相变的玩具模型，其中标量场的动力学取决于单个参数$ \Overlineλ$，它控制了核定的气泡壁的薄程度，并且与屏障相关的真空度较近。我们通过执行一系列$ \Overlineλ$范围的模拟来扩展以前的工作。重力波谱的峰值的变化高达$ 1.3 $，这可能是一种不可观察的效果。我们发现，随着$ \overlineλ\ rightArrow 0 $，考虑到$ k^{ - 1.4} $和$ k^{ - 2.2} $，$ \ \ \ \ \ \\Overlineλ$在$ k^{ - 1.4} $之间变化，重力波频谱中的紫外线（UV）功率定律变得更加陡峭。这提供了一些证据，表明真空一阶相变的潜在有效潜力的形式可以从其产生的重力波谱中确定。
In a vacuum first-order phase transition, gravitational waves are generated from collision of bubbles of the true vacuum. The spectrum from such collisions takes the form of a broken power law. We consider a toy model for such a phase transition, where the dynamics of the scalar field depends on a single parameter $\overlineλ$, which controls how thin the bubble wall is at nucleation and how close to degenerate the vacua are relative to the barrier. We extend on our previous work by performing a series of simulations with a range of $\overlineλ$. The peak of the gravitational-wave power spectrum varies by up to a factor of $1.3$, which is probably an unobservable effect. We find that the ultraviolet (UV) power law in the gravitational-wave spectrum becomes steeper as $\overlineλ \rightarrow 0$, varying between $k^{-1.4}$ and $k^{-2.2}$ for the $\overlineλ$ considered. This provides some evidence that the form of the underlying effective potential of a vacuum first-order phase transition could be determined from the gravitational-wave spectrum it produces.
