Cosmology from cross correlation of CMB lensing and galaxy surveys

Abstract

In recent years cross correlation of lensing of the Cosmic Microwave Background (CMB) with other large scale structure (LSS) tracers has been used as a method to detect CMB lensing. Current experiments are also becoming sensitive enough to measure CMB lensing without the help of auxiliary tracers. As data quality improves rapidly, it has been suggested that the CMB lensing-LSS cross correlation may provide new insights into parameters describing cosmological structure growth. In this work we perform forecasts that combine the lensing potential auto power spectrum from various future CMB experiments, the galaxy power spectrum from galaxy surveys, as well as the cross power spectrum between the two, marginalizing over a number galactic and non-galactic cosmological parameters. We find that the CMB lensing-LSS cross correlation contains significant information on parameters such as the redshift distribution and bias of LSS tracers. We also find that the cross correlation information will lead to independent probes of cosmological parameters such as neutrino mass and the reionization optical depth.

9 pages, 5 figures

References in corpus (7)

• Detection of Gravitational Lensing in the Cosmic Microwave Background
• Probing cosmological parameters with the CMB: Forecasts from full Monte Carlo simulations
• Correlation of CMB with large-scale structure: II. Weak lensing
• Evidence for dark energy from the cosmic microwave background alone using the Atacama Cosmology Telescope lensing measurements
• SPTpol: an instrument for CMB polarization measurements with the South Pole Telescope
• A Measurement of the Correlation of Galaxy Surveys with CMB Lensing Convergence Maps from the South Pole Telescope
• Measuring gravitational lensing of the cosmic microwave background using cross correlation with large scale structure

Cited by in corpus (20)

• The promising future of a robust cosmological neutrino mass measurement
• Delensing the CMB with the Cosmic Infrared Background
• Scale-dependent galaxy bias, CMB lensing-galaxy cross-correlation, and neutrino masses
• Using correlations between CMB lensing and large-scale structure to measure primordial non-Gaussianity
• CMB lensing reconstruction biases in cross-correlation with large-scale structure probes
• Planck confronts large scale structure: methods to quantify discordance
• The Atacama Cosmology Telescope: measuring radio galaxy bias through cross-correlation with lensing
• Modeling CMB Lensing Cross Correlations with {\sc CLEFT}
• Distinguishing between Neutrinos and time-varying Dark Energy through Cosmic Time
• Cosmological constraints from a joint analysis of cosmic microwave background and spectroscopic tracers of the large-scale structure
• Reconstruction of the neutrino mass as a function of redshift
• Toward a tomographic analysis of the cross-correlation between Planck CMB lensing and H-ATLAS galaxies
• Multiple Lensing of the Cosmic Microwave Background anisotropies
• Synergies between radio, optical and microwave observations at high redshift
• Cosmological parameter forecasts by a joint 2D tomographic approach to CMB and galaxy clustering
• Neutrino masses from large-scale structures: future sensitivity and theory dependence
• Real space lensing reconstruction using cosmic microwave background polarization
• Describing variations of the Fisher-matrix across parameter space
• Weak lensing of the Lyman-alpha forest
• Cross-correlating radial peculiar velocities and CMB lensing convergence