Multimessenger cosmology: Correlating cosmic microwave background and stochastic gravitational wave background measurements
Multimessenger cosmology: Correlating cosmic microwave background and stochastic gravitational wave background measurements
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DOI：
10.1103/physrevd.103.023532
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发表时间：
2021-01-26
影响因子：
5
通讯作者：
Tasinato, Gianmassimo
中科院分区：
文献类型：
--
作者：
Adshead, Peter;Afshordi, Niayesh;Tasinato, Gianmassimo
Characterizing the physical properties of the stochastic gravitational wave background (SGWB) is a key step towards identifying the nature of its possible origin.我们重点分析 SGWB 各向异性。 The existence of a nontrivial 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.至关重要的是，这种贡献与宇宙微波背景（CMB）中的温度各向异性相关。 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.由此产生的信号可以成为原始 SGWB 各向异性的确凿证据。
Characterizing the physical properties of the stochastic gravitational wave 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 nontrivial 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 a 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.