# Properties of the stochastic astrophysical gravitational wave background: astrophysical sources dependencies

## TL;DR

This paper investigates how different astrophysical models influence the anisotropies of the gravitational wave background, revealing that certain parameters significantly affect the angular power spectrum and that anisotropies offer unique astrophysical insights.

## Contribution

It demonstrates the sensitivity of AGWB anisotropies to specific astrophysical parameters, highlighting their potential as a new observable for astrophysical research.

## Key findings

- Metallicity and merger time delay significantly affect anisotropies.
- Some parameters have negligible impact on the anisotropy spectrum.
- AGWB anisotropies can provide unique astrophysical information.

## Abstract

This article explores the properties (amplitude and shape) of the angular power spectrum of the anisotropies of the astrophysical gravitational wave background (AGWB) focusing on the signatures of the astrophysical models describing sub-galactic physics. It demonstrates that while some parameters have negligible impact others, and in particular the stellar evolution models, the metallicity and the merger time delay distribution can result in relative differences of order 40% in the angular power spectrum of anisotropies in both the LIGO/Virgo and LISA frequency bands. It is also shown that the monopole and the anisotropic components of the AGWB are complementary and sensitive to different astrophysical parameters. It follows that AGWB anisotropies are a new observable with the potential to provide new astrophysical information that can not be accessed otherwise.