On the degeneracies between baryons, massive neutrinos and f(R) gravity in Stage IV cosmic shear analyses

Abstract

Modelling nonlinear structure formation is essential for current and forthcoming cosmic shear experiments. We combine the halo model reaction formalism, implemented in the REACT code, with the COSMOPOWER machine learning emulation platform, to develop and publicly release REACTEMU-FR, a fast and accurate nonlinear matter power spectrum emulator for $f(R)$ gravity with massive neutrinos. Coupled with the state-of-the-art baryon feedback emulator BCEMU, we use REACTEMU-FR to produce Markov Chain Monte Carlo forecasts for a cosmic shear experiment with typical Stage IV specifications. We find that the inclusion of highly nonlinear scales (multipoles between $1500\le \ell \le 5000$) only mildly improves constraints on most standard cosmological parameters (less than a factor of 2). In particular, the necessary modelling of baryonic physics effectively damps most constraining power on the sum of the neutrino masses and modified gravity at $\ell \gtrsim 1500$. Using an approximate baryonic physics model produces mildly improved constraints on cosmological parameters which remain unbiased at the $1\sigma$-level, but significantly biases constraints on baryonic parameters at the $>2\sigma$-level.

16 pages, 10 figures. Accepted for publication in The Open Journal of Astrophysics. REACTEMU-FR available at https://github.com/cosmopower-organization/reactemu-fr

References in corpus (31)

• Models of f(R) Cosmic Acceleration that Evade Solar-System Tests
• Massive neutrinos and cosmology
• Wide-Field InfrarRed Survey Telescope-Astrophysics Focused Telescope Assets WFIRST-AFTA 2015 Report
• PolyChord: nested sampling for cosmology
• Dark energy constraints from cosmic shear power spectra: impact of intrinsic alignments on photometric redshift requirements
• Extended Limber Approximation
• eROSITA Science Book: Mapping the Structure of the Energetic Universe
• HMcode-2020: Improved modelling of non-linear cosmological power spectra with baryonic feedback
• COSMOPOWER: emulating cosmological power spectra for accelerated Bayesian inference from next-generation surveys
• Euclid preparation: IX. EuclidEmulator2 -- Power spectrum emulation with massive neutrinos and self-consistent dark energy perturbations
• Analysis of two-point statistics of cosmic shear: III. Covariances of shear measures made easy
• Testing Screened Modified Gravity
• Emulation of baryonic effects on the matter power spectrum and constraints from galaxy cluster data
• Cosmology with the EFTofLSS and BOSS: dark energy constraints and a note on priors
• On the road to percent accuracy IV: ReACT -- computing the non-linear power spectrum beyond $\Lambda$CDM
• DES Y3 cosmic shear down to small scales: constraints on cosmology and baryons
• The halo model for cosmology: a pedagogical review
• Galaxy morphology rules out astrophysically relevant Hu-Sawicki $f(R)$ gravity
• JAX-COSMO: An End-to-End Differentiable and GPU Accelerated Cosmology Library
• Matter Power Spectrum Emulator for f(R) Modified Gravity Cosmologies
• Euclid: impact of nonlinear prescriptions on cosmological parameter estimation from weak lensing cosmic shear
• Advances in Constraining Intrinsic Alignment Models with Hydrodynamic Simulations
• On the road to percent accuracy V: the non-linear power spectrum beyond $\Lambda$CDM with massive neutrinos and baryonic feedback
• CosmoPower-JAX: high-dimensional Bayesian inference with differentiable cosmological emulators
• DEMNUni: comparing nonlinear power spectra prescriptions in the presence of massive neutrinos and dynamical dark energy
• Cosmological gravity on all scales II: Model independent modified gravity $N$-body simulations
• Euclid: Modelling massive neutrinos in cosmology -- a code comparison
• KiDS-1000 Cosmology: machine learning -- accelerated constraints on Interacting Dark Energy with COSMOPOWER
• Analytical marginalisation over photometric redshift uncertainties in cosmic shear analyses
• MGLenS: Modified gravity weak lensing simulations for emulation-based cosmological inference
• Accessing the high-$\ell$ frontier under the Reduced Shear Approximation with $k$-cut Cosmic Shear

Cited by in corpus (4)

• Euclid preparation LXXI. Simulations and nonlinearities beyond $\mathsf{\Lambda }$CDM. 3. Constraints on $f(R)$ models from the photometric primary probes
• Cosmological gravity on all scales III: non-linear matter power spectrum in phenomenological modified gravity
• Cosmological gravity on all scales IV: 3x2pt Fisher forecasts for pixelised phenomenological modified gravity
• Fast Generation of Weak Lensing Maps in Modified Gravity with COLA