LISA对来自声波的引力波的灵敏度
LISA Sensitivity to Gravitational Waves from Sound Waves
摘要：
在早期宇宙中，原始等离子体在强烈的一阶相变过程中产生的声波所产生的引力波将成为激光干涉空间天线（LISA）实验的主要目标。在这篇短文中，我根据最近在[1909.11356，2002.04615]中介绍的峰值积分灵敏度曲线（PISC）的概念，绘制了LISA对这种GW信号的预期灵敏度的全局图。特别是，我使用LISA的PISC在十个不同的粒子物理模型中以紧凑的方式对数千个基准点进行了系统的比较。所提出的分析（i）保留了完整的信息的最佳信噪比，（ii）允许不同的幂律指数描述的信号的光谱形状，（iii）占银河系的混乱噪音从紧凑的双星，和（iv）表现出预期的灵敏度对收集的数据量的依赖。这种分析的一个重要结果是，对于所考虑的一组模型，星系混淆噪声通常会使可观测场景的数量减少大约2倍，或多或少与观测时间无关。本文中给出的数值结果也可以在Zenodo上获得[http：//doi.org/10.5281/zenodo.3837877]。
英文摘要：
Gravitational waves (GWs) produced by sound waves in the primordial plasma during a strong first-order phase transition in the early Universe are going to be a main target of the upcoming Laser Interferometer Space Antenna (LISA) experiment. In this short note, I draw a global picture of LISA's expected sensitivity to this type of GW signal, based on the concept of peak-integrated sensitivity curves (PISCs) recently introduced in [1909.11356, 2002.04615]. In particular, I use LISA's PISC to perform a systematic comparison of several thousands of benchmark points in ten different particle physics models in a compact fashion. The presented analysis (i) retains the complete information on the optimal signal-to-noise ratio, (ii) allows for different power-law indices describing the spectral shape of the signal, (iii) accounts for galactic confusion noise from compact binaries, and (iv) exhibits the dependence of the expected sensitivity on the collected amount of data. An important outcome of this analysis is that, for the considered set of models, galactic confusion noise typically reduces the number of observable scenarios by roughly a factor two, more or less independent of the observing time. The numerical results presented in this paper are also available on Zenodo [http://doi.org/10.5281/zenodo.3837877].
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