Beating Lensing Cosmic Variance with Galaxy Tomography

Abstract

I discuss the use of cross correlations between galaxies with distance information and projected weak lensing dark matter maps to obtain a fully three dimensional dark matter map and power spectrum. On large scales l<100 one expects the galaxies to be biased, but not stochastic. I show that this allows a simultaneous solution of the full 3-D evolving galaxy bias and the dark matter power spectrum simultaneously. Within the photo-z information of the CFH lensing legacy survey, this allows a threefold reduction of statistical error, while a cross correlation with CLAR or other deep spectroscopic surveys allows a tenfold improvement in dark matter power accuracy on linear scales. This makes lensing surveys more sensitive to the cosmic equation of state and the neutrino masses.

minor revisions resulting in larger error bars, 5 pages, 1 figure

References in corpus (8)

• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
• Cross-correlation Tomography: Measuring Dark Energy Evolution with Weak Lensing
• Dark Energy and Matter Evolution from Lensing Tomography
• Joint CMB and Weak Lensing Analysis; Physically Motivated Constraints on Cosmological Parameters
• Weak lensing study of galaxy biasing
• Gravitational Lensing of Epoch-of-reionization Gas
• The three dimensional power spectrum of dark and luminous matter from the VIRMOS-DESCART cosmic shear survey
• Measuring the Deviation from the Linear and Deterministic Bias through Cosmic Gravitational Lensing Effects

Cited by in corpus (23)

• Gravitational Lensing
• Measuring primordial non-gaussianity without cosmic variance
• How to measure redshift-space distortions without sample variance
• Minimizing the stochasticity of halos in large-scale structure surveys
• Parameter constraints from cross-correlation of CMB lensing with galaxy clustering
• Scale-dependent galaxy bias, CMB lensing-galaxy cross-correlation, and neutrino masses
• Optimal Constraints on Local Primordial Non-Gaussianity from the Two-Point Statistics of Large-Scale Structure
• Relativistic effects in galaxy clustering in a parametrized post-Friedmann universe
• Combining weak lensing tomography and spectroscopic redshift surveys
• Cosmology without cosmic variance
• Optimal linear reconstruction of dark matter from halo catalogs
• Self calibration of photometric redshift scatter in weak lensing surveys
• Optimal Weighting in Galaxy Surveys: Application to Redshift-Space Distortions
• Halo stochasticity in global clustering analysis
• Reducing sample variance: halo biasing, non-linearity and stochasticity
• Exploring Large-scale Structure with Billions of Galaxies
• Dark Energy from Large-Scale Structure Lensing Information
• Weak lensing reconstruction through cosmic magnification I: a minimal variance map reconstruction
• Weak lensing reconstruction through cosmic magnification. II. Improved power spectrum determination and map-making
• Principal Component Analysis of Galaxy Clustering in Hyperspace of Galaxy Properties
• The Physical Origin of Dark Energy Constraints from Rubin Observatory and CMB-S4 Lensing Tomography
• Cosmological constraints from multiple tracers in spectroscopic surveys
• Probing Neutrinos from Planck and Forthcoming Galaxy Redshift Surveys