Ray-traced weak lensing convergence in screened modified gravity theories

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ID: 324897
2026
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Abstract
Abstract Weak gravitational lensing is one of the primary cosmological probes, providing powerful constraints on the cosmological model. As Stage IV surveys are expected to deliver data of unprecedented precision, accurate modeling of weak gravitational lensing observables across both linear and non-linear scales becomes increasingly important. In this work, we investigate weak lensing in modified gravity (MG) models, extensions of the standard ΛCDM cosmology in which gravity deviates from general relativity, generally introducing modifications to the lensing equation. We parametrize these modifications through the common phenomenological function Σmg and apply ray-tracing to the density maps of N-body and hydrodynamical simulations. We model the time dependence of Σmg analytically, while we introduce a phenomenological scale dependence to represent the screening mechanisms by which MG models reduce to general relativity in high-density environments. Starting from the output of the FLAMINGO hydrodynamical simulations, we generate fully ray-traced convergence maps using our modified lensing model. We analyze how the parameters of our prescription affect the weak lensing convergence power spectrum and compare these effects to other known sources of variation, in particular cosmological parameters and baryonic feedback. We find that the modifications to the lensing equation deriving from the MG model produce non-negligible signatures in the convergence power spectrum and that, within extensions of the ΛCDM framework, these effects can be larger than those induced by baryonic physics. Our results indicate that modified lensing should become a standard ingredient of the analysis of modified gravity simulations.
Reference Key
openalex_W7153103730 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Mattia Pantiri, Matthieu Schaller, Alessandra Silvestri, Jeger C. Broxterman, Joop Schaye
Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag1523
URL
https://doi.org/10.1093/mnras/stag1523
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