Constraining f(R) gravity with cross-correlation of galaxies and cosmic microwave background lensing

Abstract

We look for signatures of the Hu-Sawicki f(R) modified gravity theory, proposed to explain the observed accelerated expansion of the universe; in observations of the galaxy distribution, the cosmic microwave background (CMB), and gravitational lensing of the CMB. We study constraints obtained by using observations of only the CMB primary anisotropies, before adding the galaxy power spectrum and its cross-correlation with CMB lensing. We show that cross-correlation of the galaxy distribution with lensing measurements is crucial to breaking parameter degeneracies, placing tighter constraints on the model. In particular, we set a strong upper limit on $\log |f_{R_0}|<-4.61$ at 95% confidence level. This means that while the model may explain the accelerated expansion, its impact on large-scale structure closely resembles General Relativity. Studies of this kind with future data sets will probe smaller potential deviations from General Relativity.

11 pages, 11 figures, submitted to A&A

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• The SRG-eROSITA All-Sky Survey : Constraints on f(R) Gravity from Cluster Abundance
• Testing f(R)-gravity models with DESI DR2 2025-BAO and other cosmological data
• Euclid preparation LXXI. Simulations and nonlinearities beyond $\mathsf{\Lambda }$CDM. 3. Constraints on $f(R)$ models from the photometric primary probes
• Impact of Low ell's on Large Scale Structure Anomalies
• Unified dark fluid with null sound speed as an alternative to phantom dark energy
• Viability of general relativity and modified gravity cosmologies using high-redshift cosmic probes
• Neural Networks for cosmological model selection and feature importance using Cosmic Microwave Background data
• Investigating the effects of gravitational lensing by Hu-Sawicki $\mathbf{f}(\mathbf{R})$ gravity black holes
• Probing gravity with non-linear clustering in redshift space
• Cosmological constraints on viable $f(R)$ models using weak lensing