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An emulator-based halo model in modified gravity -- I. The halo concentration-mass relation and density profile

8 Jan 2023arXiv:2301.02970links table onlyarchive 2025-07-28

Cheng-Zong Ruan, Carolina Cuesta-Lazaro, Alexander Eggemeier, Baojiu Li, Carlton M. Baugh, Christian Arnold, Sownak Bose, César Hernández-Aguayo, Pauline Zarrouk, Christopher T. Davies

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In this series of papers we present an emulator-based halo model for the non-linear clustering of galaxies in modified gravity cosmologies. In the first paper, we present emulators for the following halo properties: the halo mass function, concentration-mass relation and halo-matter cross-correlation function. The emulators are trained on data extracted from the \textsc{FORGE} and \textsc{BRIDGE} suites of N-body simulations, respectively for two modified gravity (MG) theories: f(R) gravity and the DGP model, varying three standard cosmological parameters Ωₘ₀, H₀, σ₈, and one MG parameter, either f̅_(R0) or r_c. Our halo property emulators achieve an accuracy of ≲1% on independent test data sets. We demonstrate that the emulators can be combined with a galaxy-halo connection prescription to accurately predict the galaxy-galaxy and galaxy-matter correlation functions using the halo model framework.

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