从一级宇宙学相变探测随机引力波背景中的圆极化
Detecting circular polarisation in the stochastic gravitational-wave background from a first-order cosmological phase transition
摘要：
我们讨论了螺旋湍流产生的随机引力波背景（SGWB）的圆偏振的可观测性以下的一阶宇宙学相变，使用的模型，包括直接和逆能量级联的影响。我们探讨的强度的引力波信号和它的偏振依赖于螺旋分数，$ζ_*$，过渡的强度，$α$，气泡的大小，$R_*$，和温度，$T_*$，在过渡完成。我们计算了LISA实验中SGWB强度和偏振信号的预期信噪比，以一种对底层粒子物理模型最小敏感的方式探索参数空间。我们发现，SGWB偏振的发现通常比测量总SGWB信号更具挑战性，但对于具有大气泡尺寸和大量偏振分数的适当强的过渡是可能的。
英文摘要：
We discuss the observability of circular polarisation of the stochastic gravitational-wave background (SGWB) generated by helical turbulence following a first-order cosmological phase transition, using a model that incorporates the effects of both direct and inverse energy cascades. We explore the strength of the gravitational-wave signal and the dependence of its polarisation on the helicity fraction, $ζ_*$, the strength of the transition, $α$, the bubble size, $R_*$, and the temperature, $T_*$, at which the transition finishes. We calculate the prospective signal-to-noise ratios of the SGWB strength and polarisation signals in the LISA experiment, exploring the parameter space in a way that is minimally sensitive to the underlying particle physics model. We find that discovery of SGWB polarisation is generally more challenging than measuring the total SGWB signal, but would be possible for appropriately strong transitions with large bubble sizes and a substantial polarisation fraction.
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