Testing the early universe with anisotropies of the gravitational wave background
Testing the early universe with anisotropies of the gravitational wave background
复制标题
用引力波背景的各向异性测试早期宇宙
DOI:
10.1088/1475-7516/2022/02/040
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发表时间:
2021
影响因子:
6.4
通讯作者:
Giorgio Orlando
中科院分区:
文献类型:
--
作者:
E. Dimastrogiovanni;M. Fasiello;Ameek Malhotra;P. Meerburg;Giorgio Orlando
In this work we analyse in detail the possibility of using small and intermediate-scale gravitational wave anisotropies to constrain the inflationary particle content. First, we develop a phenomenological approach focusing on anisotropies generated by primordial tensor-tensor-scalar and purely gravitational non-Gaussianities. We highlight the quantities that play a key role in determining the detectability of the signal. To amplify the power of anisotropies as a probe of early universe physics, we consider cross-correlations with CMB temperature anisotropies. We assess the size of the signal from inflationary interactions against so-called induced anisotropies. In order to arrive at realistic estimates, we obtain the projected constraints on the non-linear primordial parameter F NL for several upcoming gravitational wave probes in the presence of the astrophysical gravitational wave background. We further illustrate our findings by considering a concrete inflationary realisation and use it to underscore a few subtleties in the phenomenological analysis.
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