Gravitational waves from first-order phase transitions: towards model separation by bubble nucleation rate
Gravitational waves from first-order phase transitions: towards model separation by bubble nucleation rate
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DOI：
10.1088/1475-7516/2017/11/050
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发表时间：
2017-08
影响因子：
6.4
通讯作者：
Ryusuke Jinno;Sangjun Lee;Hyeonseok Seong;M. Takimoto
中科院分区：
文献类型：
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作者：
Ryusuke Jinno;Sangjun Lee;Hyeonseok Seong;M. Takimoto
我们研究了宇宙一级相变中气泡碰撞产生的引力波，重点是由气泡成核率依赖产生的引力波谱模型分离的可能性。通过使用能量-动量张量的两点相关器来关联光谱的方法，我们首先在薄壁近似和包络近似下，给出了对常用的成核速率进行高斯修正的光谱的解析表达式，即Γ ε eβ tarrow eβ t−γ 2 t2。然后，我们定量地研究了光谱的变化与高斯修正的大小。结果表明，在某些物理激励的情况下，谱形状与Γ ε β t的情况有约10%的偏差.𝒪我们还简要讨论了探测器的灵敏度，区分不同的光谱形状。
We study gravitational-wave production from bubble collisions in a cosmic first-order phase transition, focusing on the possibility of model separation by the bubble nucleation rate dependence of the resulting gravitational-wave spectrum. By using the method of relating the spectrum with the two-point correlator of the energy-momentum tensor , we first write down analytic expressions for the spectrum with a Gaussian correction to the commonly used nucleation rate, Γ ∝ eβ tarrow eβ t−γ2t2, under the thin-wall and envelope approximations. Then we quantitatively investigate how the spectrum changes with the size of the Gaussian correction. It is found that the spectral shape shows 𝒪(10)% deviation from Γ ∝ eβ t case for some physically motivated scenarios. We also briefly discuss detector sensitivities required to distinguish different spectral shapes.