Probing prerecombination physics by the cross-correlation of stochastic gravitational waves and CMB anisotropies
Probing prerecombination physics by the cross-correlation of stochastic gravitational waves and CMB anisotropies
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DOI：
10.1103/physrevd.104.123547
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发表时间：
2021-06
影响因子：
5
通讯作者：
M. Braglia;S. Kuroyanagi
中科院分区：
文献类型：
--
作者：
M. Braglia;S. Kuroyanagi
研究了预复合物理对引力子通过大尺度密度微扰传播引起的随机引力波背景各向异性的影响及其与宇宙微波背景温度和E模偏振态的互关联.作为早期宇宙扩展的$\Lambda$CDM模型的例子，我们考虑流行的模型具有额外的相对论自由度，无质量的非最小耦合标量场，和早期暗能量分量。假设探测到SGWB，我们进行了Fisher分析，以定量的方式评估未来的引力波干涉仪（GWI）的能力，结合未来的大规模CMB偏振实验来约束这种变化。我们的研究结果表明，CMB和SGWB各向异性的互相关将有助于收紧与CMB单独获得的约束，与改进，显着依赖于特定的模型，以及最大角分辨率的GWI，其设计的灵敏度，和振幅的GWB的最大角分辨率$\ell_{\rm max}^{\rm GW}$。
We study the effects of pre-recombination physics on the Stochastic Gravitational Wave Background (SGWB) anisotropies induced by the propagation of gravitons through the large-scale density perturbations and their cross-correlation with Cosmic Microwave Background (CMB) temperature and E-mode polarization ones. As examples of Early Universe extensions to the $\Lambda$CDM model, we consider popular models featuring extra relativistic degrees of freedom, a massless non-minimally coupled scalar field, and an Early Dark Energy component. Assuming the detection of a SGWB, we perform a Fisher analysis to assess in a quantitative way the capability of future gravitational wave interferometers (GWIs) in conjunction with a future large-scale CMB polarization experiment to constrain such variations. Our results show that the cross-correlation of CMB and SGWB anisotropies will help tighten the constraints obtained with CMB alone, with an improvement that significantly depends on the specific model as well as the maximum angular resolution $\ell_{\rm max}^{\rm GW}$ of the GWIs, their designed sensitivity, and the amplitude $A_*$ of the monopole of the SGWB.