Studying large-scale structure probes of modified gravity with COLA

Abstract

We study the effect of two Modified Gravity (MG) theories, $f(R)$ and nDGP, on three probes of large-scale structure, the real space power spectrum estimator $Q_0$, bispectrum and voids, and validate fast approximate COLA simulations against full $N$-body simulations for the prediction of these probes. We find that using the first three even multipoles of the redshift space power spectrum to estimate $Q_0$ is enough to reproduce the MG boost factors of the real space power spectrum for both halo and galaxy catalogues. By analysing the bispectrum and reduced bispectrum of Dark Matter (DM), we show that the strong MG signal present in the DM bispectrum is mainly due to the enhanced power spectrum. We warn about adopting screening approximations in simulations as this neglects non-linear contributions that can source a significant component of the MG bispectrum signal at the DM level, but we argue that this is not a problem for the bispectrum of galaxies in redshift space where the signal is dominated by the non-linear galaxy bias. Finally, we perform void-finding on our galaxy mock catalogues by the ZOBOV watershed algorithm. To apply a linear model for Redshift-Space Distortion (RSD) in the void-galaxy cross-correlation function, we first examine the effects of MG on the void profiles entering into the RSD model. We find relevant MG signals in the integrated-density, velocity dispersion and radial velocity profiles in the nDGP theory. Fitting the RSD model for the linear growth rate, we recover the linear theory prediction in an nDGP model, which is larger than the $\Lambda$CDM prediction at the $3\sigma$ level. In $f(R)$ theory we cannot naively compare the results of the fit with the linear theory prediction as this is scale-dependent, but we obtain results that are consistent with the $\Lambda$CDM prediction.

arXiv comment26+6 pages, 19 figures, 3 tables - Accepted for publication in JCAP

References in corpus (49)

• The Structure of Cold Dark Matter Halos
• The Confrontation between General Relativity and Experiment
• 4D Gravity on a Brane in 5D Minkowski Space
• Overview of the DESI Legacy Imaging Surveys
• Models of f(R) Cosmic Acceleration that Evade Solar-System Tests
• Chameleon Fields: Awaiting Surprises for Tests of Gravity in Space
• Chameleon Cosmology
• The Rockstar Phase-Space Temporal Halo Finder and the Velocity Offsets of Cluster Cores
• Beyond the Cosmological Standard Model
• Cosmological Tests of Modified Gravity
• Galaxy Evolution from Halo Occupation Distribution Modeling of DEEP2 and SDSS Galaxy Clustering
• Fingers of God
• Statistical Analysis of Galaxy Surveys - I. Robust error estimation for 2-point clustering statistics
• ZOBOV: a parameter-free void-finding algorithm
• Solving Large Scale Structure in Ten Easy Steps with COLA
• The clustering of galaxies in the SDSS-III Baryon Oscillation Spectroscopic Survey: a large sample of mock galaxy catalogues
• Correcting for the alias effect when measuring the power spectrum using FFT
• ECOSMOG: An Efficient Code for Simulating Modified Gravity
• Accurate Estimators of Correlation Functions in Fourier Space
• Fast Estimators for Redshift-Space Clustering
• The Aspen--Amsterdam Void Finder Comparison Project
• Large-scale bias in the Universe: bispectrum method
• The Bispectrum: From Theory to Observations
• Testing Gravity using Cosmic Voids
• Modified Gravity N-body Code Comparison Project
• Constraining $M_{\nu }$ with the Bispectrum I: Breaking Parameter Degeneracies
• The Santiago-Harvard-Edinburgh-Durham void comparison I: SHEDding light on chameleon gravity tests
• Constraining $M_{\nu }$ with the Bispectrum II: The Total Information Content of the Galaxy Bispectrum
• Redshift-space distortions around voids
• COLA with scale-dependent growth: applications to screened modified gravity models
• Comparing approximate methods for mock catalogues and covariance matrices III: Bispectrum
• Cosmic voids in modified gravity models with massive neutrinos
• The Santiago-Harvard-Edinburgh-Durham void comparison II: unveiling the Vainshtein screening using weak lensing
• Using Voids to Unscreen Modified Gravity
• The nature of voids: I. Watershed void finders and their connection with theoretical models
• Cosmological constraints without fingers of God
• The Bispectrum of f(R) Cosmologies
• Efficient simulations of large scale structure in modified gravity cosmologies with comoving Lagrangian acceleration
• Cosmic voids in modified gravity scenarios
• COLA with massive neutrinos
• An accurate linear model for redshift space distortions in the void-galaxy correlation function
• A Fast Route to Non-Linear Clustering Statistics in Modified Gravity Theories
• Creating Jackknife and Bootstrap estimates of the covariance matrix for the two-point correlation function
• A Zeldovich reconstruction method for measuring redshift space distortions using cosmic voids
• Statistical Analysis of Galaxy Surveys-IV: An objective way to quantify the impact of superstructures on galaxy clustering statistics
• Enabling matter power spectrum emulation in beyond-$\Lambda$CDM cosmologies with COLA
• Fast generation of mock galaxy catalogues in modified gravity models with COLA
• Velocity profiles of matter and biased tracers around voids
• Fingerprints of modified gravity on galaxies in voids

Cited by in corpus (15)

• Why Cosmic Voids Matter: Nonlinear Structure & Linear Dynamics
• $\text{Hi-COLA}$: Fast, approximate simulations of structure formation in Horndeski gravity
• Euclid: Cosmology forecasts from the void-galaxy cross-correlation function with reconstruction
• The void-galaxy cross-correlation function with massive neutrinos and modified gravity
• Dynamic cosmography of the local Universe: Laniakea and five more watershed superclusters
• Sesame: A power spectrum emulator pipeline for beyond-$\Lambda$CDM models
• Revisiting Vainshtein Screening for fast N-body simulations
• Primordial Black Hole-Neutron Star Merger Rate in Modified Gravity
• Challenges in Constraining Gravity with Cosmic Voids
• A field-level emulator for modified gravity
• Alcock-Paczyński effect on void-finding: Implications for void-galaxy cross-correlation modelling
• Fast simulation mapping: from standard to modified gravity cosmologies using the bias assignment method
• Fast Generation of Weak Lensing Maps in Modified Gravity with COLA
• Dark energy constraints in light of theoretical priors
• Individual halo bias in models of $f(R)$ gravity