fkPT: Constraining scale-dependent modified gravity with the full-shape galaxy power spectrum

Abstract

Modified gravity models with scale-dependent linear growth typically exhibit an enhancement in the power spectrum beyond a certain scale. The conventional methods for extracting cosmological information usually involve inferring modified gravity effects via Redshift Space Distortions (RSD), particularly through the time evolution of $f{\sigma }_8$. However, classical galaxy RSD clustering analyses encounter difficulties in accurately capturing the spectrum's enhanced power, which is better obtained from the broad-band power spectrum. In this sense, full-shape analyses aim to consider survey data using comprehensive and precise models of the whole power spectrum. Yet, a major challenge in this approach is the slow computation of non-linear loop integrals for scale-dependent modified gravity, precluding the estimation of cosmological parameters using Markov Chain Monte Carlo methods. Based on recent studies, in this work we develop a perturbation theory tailored for Modified Gravity, or analogous scenarios introducing additional scales, such as in the presence of massive neutrinos. Our approach only needs the calculation of the scale-dependent growth rate $f(k,t)$ and the limit of the perturbative kernels at large scales. We called this approximate technique as fk-Perturbation Theory and implemented it into the code fkpt, capable of computing the redshift space galaxy power spectrum in a fraction of a second. We validate our modeling and code with the $f(R)$ theory MG-GLAM and General Relativity NSeries sets of simulations. The code is available at https://github.com/alejandroaviles/fkpt

34 pages, 9 figures. v2

References in corpus (29)

• The Confrontation between General Relativity and Experiment
• Models of f(R) Cosmic Acceleration that Evade Solar-System Tests
• The DESI Experiment Part I: Science,Targeting, and Survey Design
• The Effective Field Theory of Cosmological Large Scale Structures
• Resumming Cosmological Perturbations via the Lagrangian Picture: One-loop Results in Real Space and in Redshift Space
• The effects of He I 10830 on helium abundance determinations
• Clustering of dark matter tracers: generalizing bias for the coming era of precision LSS
• Gravity and Large-Scale Non-local Bias
• The IR-resummed Effective Field Theory of Large Scale Structures
• Understanding higher-order nonlocal halo bias at large scales by combining the power spectrum with the bispectrum
• Nonlinear Perturbation Theory Integrated with Nonlocal Bias, Redshift-space Distortions, and Primordial Non-Gaussianity
• Redshift-Space Distortions in Lagrangian Perturbation Theory
• Non-linear Evolution of Matter Power Spectrum in Modified Theory of Gravity
• Consistent Modeling of Velocity Statistics and Redshift-Space Distortions in One-Loop Perturbation Theory
• Analytic Prediction of Baryonic Effects from the EFT of Large Scale Structures
• FAST-PT II: an algorithm to calculate convolution integrals of general tensor quantities in cosmological perturbation theory
• The Evolution of Bias - Generalized
• Scale-dependent halo bias from scale-dependent growth
• Regularized cosmological power spectrum and correlation function in modified gravity models
• FFT-PT: Reducing the two-loop large-scale structure power spectrum to low-dimensional radial integrals
• Large Synoptic Survey Telescope: Dark Energy Science Collaboration
• Fast computation of non-linear power spectrum in cosmologies with massive neutrinos
• Self-Interacting Neutrinos in Light of Large-Scale Structure Data
• The two-mode puzzle: Confronting self-interacting neutrinos with the full shape of the galaxy power spectrum
• Cosmological constraints on early dark energy from the full shape analysis of eBOSS DR16
• Redshift space power spectrum beyond Einstein-de Sitter kernels
• Convolution Lagrangian perturbation theory for biased tracers beyond general relativity
• A new model for the full shape of the large-scale power spectrum
• Marked correlation functions in perturbation theory

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• DESI 2024 VII: Cosmological Constraints from the Full-Shape Modeling of Clustering Measurements
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• Redshift-space galaxy bispectrum in presence of massive neutrinos: A multipole expansion approach for Euclid
• Improving cosmological constraints via galaxy intrinsic alignment in full-shape analysis
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