Gravitational waves from vacuum first-order phase transitions: From the envelope to the lattice
Gravitational waves from vacuum first-order phase transitions: From the envelope to the lattice
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DOI：
10.1103/physrevd.97.123513
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发表时间：
2018-02
影响因子：
5
通讯作者：
D. Cutting;M. Hindmarsh;D. Weir
中科院分区：
文献类型：
--
作者：
D. Cutting;M. Hindmarsh;D. Weir
我们进行了大规模的数值模拟引力波的产生在一阶真空相变。我们发现引力波功率谱在高波数时的幂律为福尔斯k−1.5，而不是由包络近似产生的k−1。功率谱的峰值从包络近似的峰值移动到略低的波数。包络近似再现我们的峰值功率的结果不太好，同意只有在一个数量级。在气泡碰撞完成后，标量场围绕真实真空振荡。在引力波功率谱的紫外线中产生了一个额外的特征，并且这个特征继续线性增长，直到我们的模拟结束。额外的功能在接近气泡壁厚度的长度尺度处达到峰值，并且对引力波中的能量的贡献可以忽略不计，只要标量场质量比普朗克质量小得多。
We conduct large scale numerical simulations of gravitational wave production at a first-order vacuum phase transition. We find a power law for the gravitational wave power spectrum at high wave number which falls off as k−1.5 rather than the k−1 produced by the envelope approximation. The peak of the power spectrum is shifted to slightly lower wave numbers from that of the envelope approximation. The envelope approximation reproduces our results for the peak power less well, agreeing only to within an order of magnitude. After the bubbles finish colliding, the scalar field oscillates around the true vacuum. An additional feature is produced in the UV of the gravitational wave power spectrum, and this continues to grow linearly until the end of our simulation. The additional feature peaks at a length scale close to the bubble wall thickness and is shown to have a negligible contribution to the energy in gravitational waves, providing the scalar field mass is much smaller than the Planck mass.