Year: 2025
Type: article
Abstract: In this work, we perform a detailed analysis to constrain the Hu–Sawicki f(R) gravity model, using cosmic shear data from three prominent Stage-III weak lensing surveys: Dark Energy Survey Year 3, KiDS-1000, and Hyper Suprime-Cam Year 3. To accurately model the nonlinear matter clustering in the analysis of cosmic shear signals, we employ FREmu, a recently developed power spectrum emulator for the f(R) gravity trained on the Quijote-MG simulations. This emulator achieves precise predictions, limiting the errors to 5% on scales of 0.009h Mpc−1 < k < 0.5h Mpc−1. Our findings reveal that cosmic shear data alone impose only weak constraints on the f(R) parameter log 10 ∣ f R 0 ∣ . To improve these constraints, we incorporate state-of-the-art external observations, including data from the cosmic microwave background and baryon acoustic oscillations. The inclusion of these external data sets significantly enhances the constraints, yielding an upper limit of log 10 ∣ f R 0 ∣ < − 4.98 at the 95% confidence level.
Source: The Astrophysical Journal
Authors: Jiachen Bai, Jun-Qing Xia, Gong-Bo Zhao
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $4,499
OpenAlex ID: W4415303407