论文标题
中带重力波实验对宇宙学随机重力波背景的可检测性的影响
Impact of a Midband Gravitational Wave Experiment On Detectability of Cosmological Stochastic Gravitational Wave Backgrounds
论文作者
论文摘要
我们对影响的预测进行了预测，这是一个未来的“中间”空间引力波实验，最敏感到$ 10^{ - 2} -10 $ Hz可能会在潜在的宇宙学随机引力背景（SGWBS）的潜在检测上具有。所提出的具体提议的中带实验是天哥，b-decigo和Adge。我们提出了一个组合的幂律综合灵敏度（CPLS）曲线，该曲线结合了不同频带上的GW实验，这表明中带提高了对SGWBS的敏感性，最多两个数量级，$ 10^{ - 2} -10 $ Hz。我们将宇宙字符串和相变的GW排放视为宇宙学SGWB的基准示例。我们明确地对各种天体物理SGWB来源进行建模，最重要的是未解决的黑洞合并。使用马尔可夫链蒙特卡洛（Monte Carlo），我们证明了中带实验可以与Ligo A+和Lisa结合使用，可以显着提高对宇宙SGWBS的敏感性，并更好地将它们与天体物理SGWBS分开。特别是，我们预测，中等带实验会提高对宇宙弦张力$Gμ$的敏感性，高达$ 10 $，这是由于改善了与天体物理学来源的组件分离而驱动的。对于相转换，中带实验可以检测信号的峰值为$ 0.1-1 $ Hz，对于我们的基准模型来说，这对应于$ t _*\ sim 10^4-10^6 $ GEV的早期宇宙温度，通常超出了Ligo和Lisa的范围。中带缩小了能量差距，并更好地捕获了特征性的光谱形状信息。因此，它实质上改善了$ t_* \ sim o（10^3）$ GEV的相变的性能的测量，在electroweak量表上可能与新物理学相关，而在此能量范围内，lisa仅在此能量范围内将检测到过量，但无效地测量了相变参数。我们的建模代码和连锁店公开可用。
We make forecasts for the impact a future "midband" space-based gravitational wave experiment, most sensitive to $10^{-2}- 10$ Hz, could have on potential detections of cosmological stochastic gravitational wave backgrounds (SGWBs). Specific proposed midband experiments considered are TianGo, B-DECIGO and AEDGE. We propose a combined power-law integrated sensitivity (CPLS) curve combining GW experiments over different frequency bands, which shows the midband improves sensitivity to SGWBs by up to two orders of magnitude at $10^{-2} - 10$ Hz. We consider GW emission from cosmic strings and phase transitions as benchmark examples of cosmological SGWBs. We explicitly model various astrophysical SGWB sources, most importantly from unresolved black hole mergers. Using Markov Chain Monte Carlo, we demonstrated that midband experiments can, when combined with LIGO A+ and LISA, significantly improve sensitivities to cosmological SGWBs and better separate them from astrophysical SGWBs. In particular, we forecast that a midband experiment improves sensitivity to cosmic string tension $Gμ$ by up to a factor of $10$, driven by improved component separation from astrophysical sources. For phase transitions, a midband experiment can detect signals peaking at $0.1 - 1$ Hz, which for our fiducial model corresponds to early Universe temperatures of $T_*\sim 10^4 - 10^6$ GeV, generally beyond the reach of LIGO and LISA. The midband closes an energy gap and better captures characteristic spectral shape information. It thus substantially improves measurement of the properties of phase transitions at lower energies of $T_* \sim O(10^3)$ GeV, potentially relevant to new physics at the electroweak scale, whereas in this energy range LISA alone will detect an excess but not effectively measure the phase transition parameters. Our modelling code and chains are publicly available.
