Towards detection of relativistic effects in galaxy number counts using kSZ Tomography

Abstract

High-resolution, low-noise observations of the cosmic microwave background (CMB) planned for the near-future will enable new cosmological probes based on re-scattered CMB photons -- the secondary CMB. At the same time, enormous galaxy surveys will map out huge volumes of the observable Universe. Using the technique of kinetic Sunyaev Zel'dovich (kSZ) tomography these new probes can be combined to reconstruct the remote dipole field, the CMB dipole as observed from different vantage points in our Universe. The volume accessible to future galaxy surveys is large enough that general relativistic corrections to the observed distribution of galaxies must be taken into account. These corrections are interesting probes of gravity in their own right, but can also obscure potential signatures of primordial non-Gaussianity. In this paper, we demonstrate that correlations between the reconstructed remote dipole field and the observed galaxy number counts can in principle be used to detect general relativistic corrections. We show that neglecting general relativistic corrections leads to an $\mathcal{O}(1)$ bias on the inferred amplitude of primordial non-Gaussianity, $f_{\mathrm{NL}}$. In addition, we demonstrate that the reconstructed remote dipole field can provide useful constraining power on various bias parameters appearing in the galaxy number counts, and can significantly mitigate the effects of alignment bias.

arXiv comment13 pages, 3 figures

References in corpus (61)

• Non-Gaussianity from Inflation: Theory and Observations
• The imprints of primordial non-gaussianities on large-scale structure: scale dependent bias and abundance of virialized objects
• The linear power spectrum of observed source number counts
• What galaxy surveys really measure
• Measuring primordial non-gaussianity without cosmic variance
• New Perspective on Galaxy Clustering as a Cosmological Probe: General Relativistic Effects
• Large-scale clustering of galaxies in general relativity
• General Relativistic Description of the Observed Galaxy Power Spectrum: Do We Understand What We Measure?
• Evidence of Galaxy Cluster Motions with the Kinematic Sunyaev-Zel'dovich Effect
• Correlated Fluctuations in Luminosity Distance and the (Surprising) Importance of Peculiar Motion in Supernova Surveys
• The Kinematic Sunyaev-Zel'dovich Effect with Projected Fields: A Novel Probe of the Baryon Distribution with Planck, WMAP, and WISE Data
• The CLASSgal code for Relativistic Cosmological Large Scale Structure
• Galaxy Clustering and Galaxy Bias in a Lambda-CDM Universe
• Evidence for the kinematic Sunyaev-Zeľdovich effect with ACTPol and velocity reconstruction from BOSS
• Ultra large-scale cosmology in next-generation experiments with single tracers
• Constraining ultra large-scale cosmology with multiple tracers in optical and radio surveys
• Parameter constraints from cross-correlation of CMB lensing with galaxy clustering
• Detection of the kinematic Sunyaev-Zel'dovich effect with DES Year 1 and SPT
• Beyond the Linear-Order Relativistic Effect in Galaxy Clustering: Second-Order Gauge-Invariant Formalism
• Hunting down horizon-scale effects with multi-wavelength surveys
• The Effect of Inhomogeneities on the Luminosity Distance-Redshift Relation: is Dark Energy Necessary in a Perturbed Universe?
• Confirmation of the Copernican principle at Gpc radial scale and above from the kinetic Sunyaev Zel'dovich effect power spectrum
• Beyond the plane-parallel and Newtonian approach: Wide-angle redshift distortions and convergence in general relativity
• Galaxy number counts to second order and their bispectrum
• The value of H_0 in the inhomogeneous Universe
• Do stochastic inhomogeneities affect dark-energy precision measurements?
• Detection of the pairwise kinematic Sunyaev-Zel'dovich effect with BOSS DR11 and the Atacama Cosmology Telescope
• The Kinematic Sunyaev-Zel'dovich Effect with Projected Fields II: prospects, challenges, and comparison with simulations
• The Tau of Galaxy Clusters
• Einstein's legacy in galaxy surveys
• Observed galaxy number counts on the lightcone up to second order: I. Main result
• An exact Jacobi map in the geodesic light-cone gauge
• The second-order luminosity-redshift relation in a generic inhomogeneous cosmology
• Cosmological Parameter Estimation with Large Scale Structure Observations
• The bispectrum of relativistic galaxy number counts
• Reconstruction of the remote dipole and quadrupole fields from the kinetic Sunyaev Zel'dovich and polarized Sunyaev Zel'dovich effects
• Tidal alignments as a contaminant of redshift space distortions
• The Luminosity Distance in Perturbed FLRW Spacetimes
• The evolution of the luminosity functions in the FORS Deep Field from low to high redshift: II. The red bands
• The impact of relativistic effects on cosmological parameter estimation
• Nonlinear relativistic corrections to cosmological distances, redshift and gravitational lensing magnification. I - Key results
• Observed galaxy number counts on the lightcone up to second order: II. Derivation
• Observable Deviations from Homogeneity in an Inhomogeneous Universe
• Nonlinear relativistic corrections to cosmological distances, redshift and gravitational lensing magnification. II - Derivation
• Bias and scatter in the Hubble diagram from cosmological large-scale structure
• Complete Treatment of Galaxy Two-Point Statistics: Gravitational Lensing Effects and Redshift-Space Distortions
• The luminosity distance-redshift relation up to second order in the Poisson gauge with anisotropic stress
• The kinetic SZ tomography with spectroscopic redshift surveys
• Observational signatures of modified gravity on ultra-large scales
• Gravity at the horizon: on relativistic effects, CMB-LSS correlations and ultra-large scales in Horndeski's theory
• Deprojecting Sunyaev-Zeldovich statistics
• Optimised angular power spectra for spectroscopic galaxy surveys
• Detecting the polarization induced by scattering of the microwave background quadrupole in galaxy clusters
• Measurement of the pairwise kinematic Sunyaev-Zeldovich effect with Planck and BOSS data
• Analyzing the cosmic variance limit of remote dipole measurements of the cosmic microwave background using the large-scale kinetic Sunyaev Zel'dovich effect
• What is the distance to the CMB?
• The dark flow induced small scale kinetic Sunyaev Zel'dovich effect
• A direct measure of free electron gas via the Kinematic Sunyaev-Zel'dovich effect in Fourier-space analysis
• Higher order relativistic galaxy number counts: dominating terms
• General Relativistic Corrections to the Weak Lensing Convergence Power Spectrum
• Extracting the late-time kinetic Sunyaev-Zel'dovich effect

Cited by in corpus (15)

• Primordial non-Gaussianity without tails -- how to measure fNL with the bulk of the density PDF
• Cosmology with the moving lens effect
• Probing correlated compensated isocurvature perturbations using scale-dependent galaxy bias
• Towards testing CMB anomalies using the kinetic and polarized Sunyaev Zel'dovich effects
• Exploring KSZ velocity reconstruction with $N$-body simulations and the halo model
• Wide-angle and relativistic effects in Fourier-space clustering statistics
• Velocity reconstruction with the cosmic microwave background and galaxy surveys
• Constraining primordial non-Gaussianity by combining next-generation galaxy and 21 cm intensity mapping surveys
• Reconstructing large scales at cosmic dawn
• Remote Dipole Field Reconstruction with Dusty Galaxies
• Accurate relativistic observables from post-processing light cone catalogues
• Novel Cosmological Tests from Combining Galaxy Lensing and the Polarized Sunyaev-Zel'dovich Effect
• Faint Galaxy Number Counts in the Durhamand SDSS Catalogues
• Cluster optical depth and pairwise velocity estimation using machine learning
• Large-scale Modeling of the Observed Power Spectrum Multipoles