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Unraveling Cosmological Anisotropies within Stochastic Gravitational Wave Backgrounds by Cui, Yanou; Kumar, Soubhik; Sundrum, Raman; Tsai, Yuhsin is a scholarly article available to read on EtoBox.

What is Unraveling Cosmological Anisotropies within Stochastic Gravitational Wave Backgrounds about?

Identifying the anisotropies in a cosmologically sourced stochastic gravitational wave background (SGWB) would be of significance in shedding light on the nature of primordial inhomogeneities. For example, if SGWB carries isocurvature fluctuations, it would provide evidence for a multi-field inflationary origin of these inhomogeneities. However, this is challenging in practice due to finite detector sensitivity and also the presence of the astrophysical foregrounds that can compete with the cosmological signal. In this work, we explore the prospects for measuring cosmological SGWB anisotropies in the presence of an astrophysical counterpart and detector noise. To illustrate the main idea, we perform a Fisher analysis using a well-motivated cosmological SGWB template corresponding to a first order phase transition, and an astrophysical SGWB template corresponding to extra-galactic binary mergers, and compute the uncertainty with which various parameters characterizing the isotropic and anisotropic components can be extracted. We also discuss some subtleties and caveats involving shot noise in the astrophysical foreground. Overall, we show that upcoming experiments, e.g., LISA, Taiji

Author

Cui, Yanou; Kumar, Soubhik; Sundrum, Raman; Tsai, Yuhsin

Published

2023

Language

EN