CCAPP Seminar: "Lensing Cross Correlations: Measurements and Applications" Sukhdeep Singh (Carnegie Mellon U)

Image
Oval
January 17, 2017
11:30AM - 12:30PM
Location
PRB 4138

Date Range
Add to Calendar 2017-01-17 11:30:00 2017-01-17 12:30:00 CCAPP Seminar: "Lensing Cross Correlations: Measurements and Applications" Sukhdeep Singh (Carnegie Mellon U) Weak gravitational lensing has emerged as an important cosmological probe for our understanding of dark matter and dark energy. Cross correlations between lensing and galaxy over-density map the stacked matter distribution around galaxies and provide important information about matter correlations and the growth of large scale structure. I will present our measurements of galaxy-galaxy lensing and galaxy-CMB lensing cross correlations using SDSS III-BOSS spectroscopic samples with SDSS galaxy lensing and Planck CMB lensing. I will also address some of the issues in covariance estimation for these measurements. When combined with galaxy clustering and RSD measurements, these measurements also provide strong constraints on the standard cosmological model. As applications of these measurements, I will discuss the recent measurements of the E_G parameter that quantifies deviations from general relativity, cosmological parameter constraints and the estimation of relative calibration uncertainties between galaxy shear and CMB lensing. PRB 4138 Center for Cosmology and AstroParticle Physics (CCAPP) ccapp@osu.edu America/New_York public
Description

Weak gravitational lensing has emerged as an important cosmological probe for our understanding of dark matter and dark energy. Cross correlations between lensing and galaxy over-density map the stacked matter distribution around galaxies and provide important information about matter correlations and the growth of large scale structure. I will present our measurements of galaxy-galaxy lensing and galaxy-CMB lensing cross correlations using SDSS III-BOSS spectroscopic samples with SDSS galaxy lensing and Planck CMB lensing. I will also address some of the issues in covariance estimation for these measurements. When combined with galaxy clustering and RSD measurements, these measurements also provide strong constraints on the standard cosmological model. As applications of these measurements, I will discuss the recent measurements of the E_G parameter that quantifies deviations from general relativity, cosmological parameter constraints and the estimation of relative calibration uncertainties between galaxy shear and CMB lensing.

Events Filters: