Citation

BibTex format

@article{Mentasti:2024:06/055,
author = {Mentasti, G and Contaldi, CR and Peloso, M},
doi = {06/055},
journal = {Journal of Cosmology and Astroparticle Physics},
title = {Probing the galactic and extragalactic gravitational wave backgrounds with space-based interferometers},
url = {http://dx.doi.org/10.1088/1475-7516/2024/06/055},
volume = {2024},
year = {2024}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - We employ the formalism developed in [1] and [2] to study the prospect of detecting an anisotropic Stochastic Gravitational Wave Background (SGWB) with the Laser Interferometer Space Antenna (LISA) alone, and combined with the proposed space-based interferometer Taiji. Previous analyses have been performed in the frequency domain only. Here, we study the detectability of the individual coefficients of the expansion of the SGWB in spherical harmonics, by taking into account the specific motion of the satellites. This requires the use of time-dependent response functions, which we include in our analysis to obtain an optimal estimate of the anisotropic signal. We focus on two applications. Firstly, the reconstruction of the anisotropic galactic signal without assuming any prior knowledge of its spatial distribution. We find that both LISA and LISA with Taiji cannot put tight constraints on the harmonic coefficients for realistic models of the galactic SGWB. We then focus on the discrimination between a galactic signal of known morphology but unknown overall amplitude and an isotropic extragalactic SGWB component of astrophysical origin. In this case, we find that the two surveys can confirm, at a confidence level  3σ, the existence of both the galactic and extragalactic background if both have amplitudes as predicted in standard models. We also find that, in the LISA-only case, the analysis in the frequency domain (under the assumption of a time average of data taken homogeneously across the year) provides a nearly identical determination of the two amplitudes as compared to the optimal analysis.
AU  - Mentasti,G
AU  - Contaldi,CR
AU  - Peloso,M
DO  - 06/055
PY  - 2024///
TI  - Probing the galactic and extragalactic gravitational wave backgrounds with space-based interferometers
T2  - Journal of Cosmology and Astroparticle Physics
UR  - http://dx.doi.org/10.1088/1475-7516/2024/06/055
VL  - 2024
ER  -
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