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Cosmology with Multiple Galaxies by Chawak, Chaitanya; Villaescusa-Navarro, Francisco; Rojas, Nicolas Echeverri; Ni, Yueying; Hahn, ChangHoon; Angles-Alcazar, Daniel is a scholarly article available to read on EtoBox.

What is Cosmology with Multiple Galaxies about?

Recent works have discovered a relatively tight correlation between $\Omega_{\rm m}$ and properties of individual simulated galaxies. Because of this, it has been shown that constraints on $\Omega_{\rm m}$ can be placed using the properties of individual galaxies while accounting for uncertainties on astrophysical processes such as feedback from supernova and active galactic nuclei. In this work, we quantify whether using the properties of multiple galaxies simultaneously can tighten those constraints. For this, we train neural networks to perform likelihood-free inference on the value of two cosmological parameters ($\Omega_{\rm m}$ and $\sigma_8$) and four astrophysical parameters using the properties of several galaxies from thousands of hydrodynamic simulations of the CAMELS project. We find that using properties of more than one galaxy increases the precision of the $\Omega_{\rm m}$ inference. Furthermore, using multiple galaxies enables the inference of other parameters that were poorly constrained with one single galaxy. We show that the same subset of galaxy properties are responsible for the constraints on $\Omega_{\rm m}$ from one and multiple galaxies. Finally, we quanti

Author

Chawak, Chaitanya; Villaescusa-Navarro, Francisco; Rojas, Nicolas Echeverri; Ni, Yueying; Hahn, ChangHoon; Angles-Alcazar, Daniel

Published

2023

Language

EN