论文标题
相对论粒子在随机重力波背景的各向异性上的烙印
The Imprint of Relativistic Particles on the Anisotropies of the Stochastic Gravitational-Wave Background
论文作者
论文摘要
随机重力波背景（SGWB）预计将是重力波（GW）干涉法的关键。它的检测将打开有关早期宇宙宇宙学，紧凑物体的天体物理学的新窗口，如本字母所示，在宇宙的粒子物理含量上。在这封信中，我们表明，除了它们对宇宙微波背景（CMB）和大规模结构（LSS）（LSS）的影响外，早期宇宙中的相对论颗粒还对SGWB的各向异性留下了明显的烙印。特别是，我们表明，由于Sachs-Wolfe（SW）和Integrated Sachs-Wolfe（ISW）项都受到影响，因此，分离的相对论粒子数量的变化会移动SGWB的角功率谱。作为非常大的角度效应，这些效果可为未来的GW干涉仪提供新的可测试预测。
The Stochastic Gravitational-Wave Background (SGWB) is expected to be a key observable for Gravitational-Wave (GW) interferometry. Its detection will open a new window on early Universe cosmology, on the astrophysics of compact objects and, as shown in this Letter, on the particle physics content of the Universe. In this Letter we show that, besides their effects on the Cosmic Microwave Background (CMB) and on Large Scale Structure (LSS), relativistic particles in the early Universe leave a clear imprint on the anisotropies of the SGWB. In particular we show that a change in the number of decoupled relativistic particles shifts the angular power spectrum of the SGWB, as both the Sachs-Wolfe (SW) and the Integrated Sachs-Wolfe (ISW) terms are affected. Being very large-angle effects, these lead to new testable predictions for future GW interferometers.
