多信使宇宙学：关联CMB和SGWB测量
Multimessenger Cosmology: correlating CMB and SGWB measurements
摘要：
描述随机引力波背景（SGWB）的物理性质是确定其可能起源的关键一步。我们集中我们的分析SGWB各向异性。在压缩位形中存在非平凡的原始标量-张量-张量（STT）关联，这可以从长波长标量模对引力波功率谱的各向异性贡献来推断。重要的是，这种贡献与宇宙微波背景（CMB）中的温度各向异性有关。我们表明，对于产生适当大的STT非高斯性的暴胀模型，互相关的CMB与随机背景的引力波是一个非常有效的探测早期宇宙物理。由此产生的信号可以是原始SGWB各向异性的吸烟枪。
英文摘要：
Characterizing the physical properties of the stochastic gravitational waves background (SGWB) is a key step towards identifying the nature of its possible origin. We focus our analysis on SGWB anisotropies. The existence of a non-trivial primordial scalar-tensor-tensor (STT) correlation in the squeezed configuration may be inferred from the effect that a long wavelength scalar mode has on the gravitational wave power spectrum: an anisotropic contribution. Crucially, such contribution is correlated with temperature anisotropies in the cosmic microwave background (CMB). We show that, for inflationary models that generate suitably large STT non-Gaussianities, cross-correlating the CMB with the stochastic background of gravitational waves is a very effective probe of early universe physics. The resulting signal can be a smoking-gun for primordial SGWB anisotropies.
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