A semi-analytic estimate for the effective sound speed counterterm in the EFTofLSS

Abstract

The Effective Field Theory of Large Scale Structure (EFTofLSS) has found tremendous success as a perturbative framework for the evolution of large scale structure, and it is now routinely used to compare theoretical predictions against cosmological observations. The model for the total matter field includes one nuisance parameter at 1-loop order, the effective sound speed, which can be extracted by matching the EFT to full N-body simulations. In this work we first leverage the Layzer-Irvine cosmic energy equation to show that the equation of state can be exactly computed with knowledge of the fully nonlinear power spectrum. When augmented with separate universe methods, we show one can estimate the effective sound speed. This estimate is in good agreement with simulation results, with errors at the few tens of percent level. We apply our method to investigate the cosmology dependence of the effective sound speed and to shed light on what cosmic structures shape its value.

17+10 pages, 9 figures. Matching JCAP accepted version

References in corpus (34)

• The Effective Field Theory of Cosmological Large Scale Structures
• The IR-resummed Effective Field Theory of Large Scale Structures
• A critical look at cosmological perturbation theory techniques
• Generation of Vorticity and Velocity Dispersion by Orbit Crossing
• The Bispectrum in the Effective Field Theory of Large Scale Structure
• Separate Universe Simulations
• Cosmology with the EFTofLSS and BOSS: dark energy constraints and a note on priors
• Cosmology with the Galaxy Bispectrum Multipoles: Optimal Estimation and Application to BOSS Data
• The MillenniumTNG Project: High-precision predictions for matter clustering and halo statistics
• Redshift Space Distortions in the Effective Field Theory of Large Scale Structures
• Consistency of effective field theory analyses of the BOSS power spectrum
• How much information can be extracted from galaxy clustering at the field level?
• Constraints on modified gravity from the BOSS galaxy survey
• Cosmological constraints from the power spectrum of eBOSS quasars
• Consistency tests of field level inference with the EFT likelihood
• EFTofLSS meets simulation-based inference: ${\sigma }_8$ from biased tracers
• Unveiling dark forces with measurements of the Large Scale Structure of the Universe
• Analysis of Unified Galaxy Power Spectrum Multipole Measurements
• Euclid preparation. XLI. Galaxy power spectrum modelling in real space
• On Soft Limits of Large-Scale Structure Correlation Functions
• From 100 kpc to 10 Gpc: Dark Matter self-interactions before and after DESI
• The Renormalization Group for Large-Scale Structure: Primordial non-Gaussianities
• The two-loop power spectrum in redshift space
• Direct signatures of the formation time of galaxies
• Unveiling galaxy pair alignment in cosmic filaments: A 3D exploration using EAGLE simulation
• Full-shape analysis with simulation-based priors: cosmological parameters and the structure growth anomaly
• Testing the assumptions of the Effective Field Theory of Large-Scale Structure
• What makes a cosmic filament? The dynamical origin and identity of filaments I. fundamentals in 2D
• Properties of the diffuse gas component in filaments detected in the Dianoga cosmological simulations
• Cosmological perturbation theory for large scale structure in phase space
• HOD-informed prior for EFT-based full-shape analyses of LSS
• One-point Statistics in various cosmic environments in the presence of massive neutrinos
• Cosmic Web Dynamics: Forces and Strains
• Time Non-locality in Dark Matter and LSS

Cited by in corpus (1)

• Cosmological perturbation theory for large scale structure in phase space