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arXiv 2106.02591astro-ph.COgr-qc
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天体物理学和宇宙学引力波背景与宇宙微波背景的互相关

Cross-correlating Astrophysical and Cosmological Gravitational Wave Backgrounds with the Cosmic Microwave Background

Angelo Ricciardone, Lorenzo Valbusa Dall'Armi, Nicola Bartolo, Daniele Bertacca, Michele Liguori, Sabino Matarrese

摘要:

广义相对论为我们提供了一个非常强大的工具,从随机引力波背景(SGWB)中同时提取天体物理和宇宙学信息:与其他宇宙示踪剂的互相关,因为它们的各向异性具有共同的起源和相同的扰动测地线。在这封信中,我们探讨了宇宙学和天体物理学SGWB与宇宙微波背景(CMB)各向异性的互相关,表明未来的GW探测器,如LISA或BBO,有能力测量这样的互相关信号。我们还提出,作为一个新的工具,在这种情况下,约束实现地图的SGWBs提取的高分辨率CMB { \it普朗克}地图。这种技术允许,在低噪声制度,忠实地重建预期的SGWB地图开始从CMB测量。

英文摘要:

General Relativity provides us with an extremely powerful tool to extract at the same time astrophysical and cosmological information from the Stochastic Gravitational Wave Backgrounds (SGWBs): the cross-correlation with other cosmological tracers, since their anisotropies share a common origin and the same perturbed geodesics. In this letter we explore the cross-correlation of the cosmological and astrophysical SGWBs with Cosmic Microwave Background (CMB) anisotropies, showing that future GW detectors, such as LISA or BBO, have the ability to measure such cross-correlation signals. We also present, as a new tool in this context, constrained realization maps of the SGWBs extracted from the high-resolution CMB {\it Planck} maps. This technique allows, in the low-noise regime, to faithfully reconstruct the expected SGWB map by starting from CMB measurements.

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