The effect of relative velocity and density perturbations between baryons and dark matter on the clustering of galaxies

Abstract

Pre-recombination acoustic oscillations induce non-adiabatic perturbations between baryons and dark matter, corresponding to a constant relative-density ${\delta }_{bc}$ and decaying relative-velocity perturbation ${\vec{v}}_{bc}$. Due to their significant large-scale correlations and prominent baryon acoustic oscillation (BAO) features, these modes are potentially important for the use of the BAO as standard ruler. We present a complete treatment of the effects of the baryon-CDM perturbations on galaxy clustering in the context of a rigorous perturbative bias expansion. The leading effects are proportional to ${\delta }_{bc}$ and ${\theta }_{bc}={\partial }_i{v}_{bc}^i$. We estimate the magnitude of these terms through the excursion set approach. The contribution from $v_{bc}^2$, which has attracted significant attention recently, contributes at subleading (1-loop) order. The relative-density contribution ${\delta }_{bc}$ is expected to be by far the largest contribution. We also point out contributions to the galaxy velocity bias, the largest of which is simply $v_{bc}$, leading to a term $\propto {\mu }^2{\theta }_{bc}$ in the redshift-space galaxy power spectrum $P_g^s(k,\mu )$. Complete expressions of the galaxy power spectrum at 1-loop order are given, which contain several new terms.

16 pages, 6 figures; v2: substantially extended version including relative density mode and more estimates of bias parameters; v3: expanded introduction and conclusions, corrected Eq (46); matches PRD accepted version

References in corpus (9)

• Clustering of dark matter tracers: generalizing bias for the coming era of precision LSS
• Non-linear Evolution of f(R) Cosmologies III: Halo Statistics
• Large-scale BAO signatures of the smallest galaxies
• Galaxy Bias and Primordial Non-Gaussianity
• Analytic Prediction of Baryonic Effects from the EFT of Large Scale Structures
• On the signature of the baryon-dark matter relative velocity in the two and three-point galaxy correlation functions
• Third-order Perturbation Theory With Non-linear Pressure
• Non-local bias in the halo bispectrum with primordial non-Gaussianity
• Large scale distribution of total mass versus luminous matter from Baryon Acoustic Oscillations: First search in the SDSS-III BOSS Data Release 10

Cited by in corpus (58)

• The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: cosmological analysis of the DR12 galaxy sample
• Large-Scale Galaxy Bias
• The clustering of the SDSS-IV extended Baryon Oscillation Spectroscopic Survey DR14 quasar sample: First measurement of Baryon Acoustic Oscillations between redshift 0.8 and 2.2
• Beyond linear galaxy alignments
• Large-scale dark matter simulations
• Redshift-Space Distortions in Lagrangian Perturbation Theory
• The Galaxy Power Spectrum and Bispectrum in Redshift Space
• Simulations and symmetries
• DESI 2024 V: Full-Shape Galaxy Clustering from Galaxies and Quasars
• Robust Velocity-induced Acoustic Oscillations at Cosmic Dawn
• Higher-order initial conditions for mixed baryon-CDM simulations
• Galaxy bias and primordial non-Gaussianity: insights from galaxy formation simulations with IllustrisTNG
• Unveiling dark fifth forces with linear cosmology
• Galaxy bias from forward models: linear and second-order bias of IllustrisTNG galaxies
• Theoretical Systematics of Future Baryon Acoustic Oscillation Surveys
• Very Massive Tracers and Higher Derivative Biases
• Modeling CMB Lensing Cross Correlations with {\sc CLEFT}
• Baryon Acoustic Oscillation Theory and Modelling Systematics for the DESI 2024 results
• Constraining the Baryon-Dark Matter Relative Velocity with the Large-Scale 3-Point Correlation Function of the SDSS BOSS DR12 CMASS Galaxies
• Biased Tracers of Two Fluids in the Lagrangian Picture
• Response Approach to the Matter Power Spectrum Covariance
• Validating a minimal galaxy bias method for cosmological parameter inference using HSC-SDSS mock catalogs
• Probing correlated compensated isocurvature perturbations using scale-dependent galaxy bias
• Baryon-CDM isocurvature galaxy bias with IllustrisTNG
• Redshift-space streaming velocity effects on the Lyman-$\alpha$ forest baryon acoustic oscillation scale
• Small-scale structure and the Lyman-$\alpha$ forest baryon acoustic oscillation feature
• Cosmological perturbations for two cold fluids in $\Lambda$CDM
• Cosmological advection flows in the presence of primordial black holes as dark matter and formation of first sources
• Unveiling dark forces with measurements of the Large Scale Structure of the Universe
• Accurate initial conditions in mixed Dark Matter--Baryon simulations
• The Ly$\alpha$ forest flux correlation function: a perturbation theory perspective
• Violation of the consistency relations for large-scale structure with dark energy
• An Analytic Hybrid Halo + Perturbation Theory Model for Small-scale Correlators: Baryons, Halos, and Galaxies
• Imprints of Reionization in Galaxy Clustering
• Redshift Space Distortion of 21cm line at 1<z<5 with Cosmological Hydrodynamic Simulations
• A Model-Insensitive Baryon Acoustic Oscillation Feature in the 21 cm Signal from Reionization
• Measuring the cosmic expansion rate using 21-cm velocity acoustic oscillations
• Optical depth to reionization from perturbative 21cm clustering
• Compensated Isocurvature Perturbations in the Galaxy Power Spectrum
• Testing the equivalence principle on cosmological scales using the odd multipoles of galaxy cross-power spectrum and bispectrum
• Formation of First Galaxies inside Density Peaks and Voids under the Influence of Dark Matter-Baryon Streaming Velocity, I: Initial Condition and Simulation Scheme
• Measuring dark matter-neutrino relative velocity on cosmological scales
• Hubble tension as a window on the gravitation of the dark matter sector: Exploration of a family of models
• Bounds on Velocity-Dependent Dark Matter-Baryon Scattering from Large-Scale Structure
• Large scale distribution of mass versus light from Baryon Acoustic Oscillations: Measurement in the final SDSS-III BOSS Data Release 12
• Cosmological Constraints on the Global Star Formation Law of Galaxies: Insights From Baryon Acoustic Oscillation Intensity Mapping
• Joint 21-cm and CMB Forecasts for Constraining Self-Interacting Massive Neutrinos
• Detecting Baryon Acoustic Oscillations in Dark Matter from Kinematic Weak Lensing Surveys
• The Effective Field Theory of Large Scale Structure for Mixed Dark Matter Scenarios
• Effects of dynamical friction on perturbations for evolving dark energy
• Accelerating BAO Scale Fitting Using Taylor Series
• Dipole Distortions in the Intergalactic Medium
• Cosmic voids and BAO with relative baryon-CDM perturbations
• Streaming Velocity Effects on the Post-reionization 21 cm Baryon Acoustic Oscillation Signal
• Sound Mode and Scale-Dependent Growth in Two-Fluid Dynamical Dark Energy
• Dark Matter Recoupling
• Non-Gaussianity in the Squeezed Three-Point Correlation from the Relativistic Effects
• Exploring delaying and heating effects on the 21-cm signature of fuzzy dark matter