期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 1, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2023/01/018
关键词
primordial gravitational waves (theory); inflation; physics of the early universe; primordial black holes
This paper discusses the anisotropic features of gravitational wave backgrounds originated from the universe, particularly focusing on the GW background generated by peaked scalar spectra. The frequency dependence and detectability of these GW anisotropies are studied, with emphasis on cross-correlations among different space-based GW detectors and GW-CMB experiments.
Gravitational wave (GW) backgrounds of cosmological origin are expected to be nearly isotropic, with small anisotropies resembling those of the cosmic microwave background. We analyse the case of a scalar-induced GW background and clarify in the process the relation between two different approaches to calculating GW anisotropies. We focus on GW scenarios sourced by a significantly peaked scalar spectrum, which are frequently considered in the context of primordial black holes production. We show that the resulting GW anisotropies are characterised by a distinct frequency dependence. We explore the observational consequences concentrating on a GW background enhanced in the frequency band of space-based GW detectors. We study the detectability of the signal through both cross-correlations among different space-based GW detectors, and among GW and CMB experiments.
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