MGLENS: Modified gravity weak lensing simulations for emulation-based cosmological inference

Harnois-Déraps, Joachim; Hernandez-Aguayo, Cesar; Cuesta-Lazaro, Carolina; Arnold, Christian; Li, Baojiu; Davies, Christopher T; Cai, Yan-Chuan

Abstract

We present MGLENS, a large series of modified gravity lensing simulations tailored for cosmic shear data analyses and forecasts in which cosmological and modified gravity parameters are varied simultaneously. Based on the FORGE and BRIDGE N-body simulation suites presented in companion papers, we construct 100 × 5000 deg2 of mock Stage-IV lensing data from two 4D Latin hypercubes that sample cosmological and gravitational parameters in f(R) and nDGP gravity, respectively. These are then used to validate our inference analysis pipeline based on the lensing power spectrum, exploiting our implementation of these modified gravity models within the COSMOSIS cosmological inference package. Sampling this new likelihood, we find that cosmic shear can achieve 95 per cent CL constraints on the modified gravity parameters of log10[fR0 ] < −4.77 and log10[H0rc] > 0.09, after marginalizing over intrinsic alignments of galaxies and including scales up to  = 5000. We also investigate the impact of photometric uncertainty, scale cuts, and covariance matrices. We finally explore the consequences of analysing MGLENS data with the wrong gravity model, and report catastrophic biases for a number of possible scenarios. The Stage-IV MGLENS simulations,
the FORGE and BRIDGE emulators and the COSMOSIS interface modules will be made publicly available upon journal acceptance.

Citation

Harnois-Déraps, J., Hernandez-Aguayo, C., Cuesta-Lazaro, C., Arnold, C., Li, B., Davies, C. T., & Cai, Y. (2023). MGLENS: Modified gravity weak lensing simulations for emulation-based cosmological inference. Monthly Notices of the Royal Astronomical Society, 525(4), 6336–6358. https://doi.org/10.1093/mnras/stad2700

• Journal Article Type: Article
• Acceptance Date: Sep 5, 2023
• Online Publication Date: Sep 7, 2023
• Publication Date: 2023-11
• Deposit Date: Jan 30, 2024
• Publicly Available Date: Jan 30, 2024
• Journal: Monthly Notices of the Royal Astronomical Society
• Print ISSN: 0035-8711
• Publisher: Royal Astronomical Society
• Peer Reviewed: Peer Reviewed
• Volume: 525
• Issue: 4
• Pages: 6336–6358
• DOI: https://doi.org/10.1093/mnras/stad2700
• Public URL: https://durham-repository.worktribe.com/output/2187362