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Title: Cosmological lensing ratios with DES Y1, SPT, and Planck

Abstract

Correlations between tracers of the matter density field and gravitational lensing are sensitive to the evolution of the matter power spectrum and the expansion rate across cosmic time. Appropriately defined ratios of such correlation functions, on the other hand, depend only on the angular diameter distances to the tracer objects and to the gravitational lensing source planes. Because of their simple cosmological dependence, such ratios can exploit available signal-to-noise ratio down to small angular scales, even where directly modelling the correlation functions is difficult. We present a measurement of lensing ratios using galaxy position and lensing data from the Dark Energy Survey, and CMB lensing data from the South Pole Telescope and Planck, obtaining the highest precision lensing ratio measurements to date. Relative to the concordance ΛCDM model, we find a best-fitting lensing ratio amplitude of A = 1.1 ± 0.1. We use the ratio measurements to generate cosmological constraints, focusing on the curvature parameter. We demonstrate that photometrically selected galaxies can be used to measure lensing ratios, and argue that future lensing ratio measurements with data from a combination of LSST and Stage-4 CMB experiments can be used to place interesting cosmological constraints, even after considering the systematic uncertaintiesmore » associated with photometric redshift and galaxy shear estimation.« less

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
National Science Foundation (NSF); University of Illinois-Urbana-Champaign - National Center for Supercomputing Applications; USDOE Office of Science - Office of High Energy Physics
OSTI Identifier:
1573359
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 487; Journal Issue: 1
Country of Publication:
United States
Language:
English
Subject:
cosmological parameters; cosmology: observations; gravitational lensing: weak; large-scale structure of Universe

Citation Formats

Prat, Judith, Baxter, E., Shin, T., Sanchez, C., Chang, C., Jain, B., Bleem, L. E., Carlstrom, J. E., Chang, C. L., and Padin, S. Cosmological lensing ratios with DES Y1, SPT, and Planck. United States: N. p., 2019. Web. doi:10.1093/mnras/stz1309.
Prat, Judith, Baxter, E., Shin, T., Sanchez, C., Chang, C., Jain, B., Bleem, L. E., Carlstrom, J. E., Chang, C. L., & Padin, S. Cosmological lensing ratios with DES Y1, SPT, and Planck. United States. doi:10.1093/mnras/stz1309.
Prat, Judith, Baxter, E., Shin, T., Sanchez, C., Chang, C., Jain, B., Bleem, L. E., Carlstrom, J. E., Chang, C. L., and Padin, S. Mon . "Cosmological lensing ratios with DES Y1, SPT, and Planck". United States. doi:10.1093/mnras/stz1309.
@article{osti_1573359,
title = {Cosmological lensing ratios with DES Y1, SPT, and Planck},
author = {Prat, Judith and Baxter, E. and Shin, T. and Sanchez, C. and Chang, C. and Jain, B. and Bleem, L. E. and Carlstrom, J. E. and Chang, C. L. and Padin, S.},
abstractNote = {Correlations between tracers of the matter density field and gravitational lensing are sensitive to the evolution of the matter power spectrum and the expansion rate across cosmic time. Appropriately defined ratios of such correlation functions, on the other hand, depend only on the angular diameter distances to the tracer objects and to the gravitational lensing source planes. Because of their simple cosmological dependence, such ratios can exploit available signal-to-noise ratio down to small angular scales, even where directly modelling the correlation functions is difficult. We present a measurement of lensing ratios using galaxy position and lensing data from the Dark Energy Survey, and CMB lensing data from the South Pole Telescope and Planck, obtaining the highest precision lensing ratio measurements to date. Relative to the concordance ΛCDM model, we find a best-fitting lensing ratio amplitude of A = 1.1 ± 0.1. We use the ratio measurements to generate cosmological constraints, focusing on the curvature parameter. We demonstrate that photometrically selected galaxies can be used to measure lensing ratios, and argue that future lensing ratio measurements with data from a combination of LSST and Stage-4 CMB experiments can be used to place interesting cosmological constraints, even after considering the systematic uncertainties associated with photometric redshift and galaxy shear estimation.},
doi = {10.1093/mnras/stz1309},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 1,
volume = 487,
place = {United States},
year = {2019},
month = {7}
}

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