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Title: General requirements on matter power spectrum predictions for cosmology with weak lensing tomography

Abstract

Forthcoming projects such as DES, LSST, WFIRST, and Euclid aim to measure weak lensing shear correlations with unprecedented precision, constraining the dark energy equation of state at the percent level. Reliance on photometrically-determined redshifts constitutes a major source of uncertainty for these surveys. Additionally, interpreting the weak lensing signal requires a detailed understanding of the nonlinear physics of gravitational collapse. We present a new analysis of the stringent calibration requirements for weak lensing analyses of future imaging surveys that addresses both photo-z uncertainty and errors in the calibration of the matter power spectrum. We find that when photo-z uncertainty is taken into account the requirements on the level of precision in the prediction for the matter power spectrum are more stringent than previously thought. Including degree-scale galaxy clustering statistics in a joint analysis with weak lensing not only strengthens the survey's constraining power by ∼ 20%, but can also have a profound impact on the calibration demands, decreasing the degradation in dark energy constraints with matter power spectrum uncertainty by a factor of 2-5. Similarly, using galaxy clustering information significantly relaxes the demands on photo-z calibration. We compare these calibration requirements to the contemporary state-of-the-art in photometric redshift estimation andmore » predictions of the power spectrum and suggest strategies to utilize forthcoming data optimally.« less

Authors:
;  [1];  [2]
  1. Pittsburgh Particle physics Astrophysics and Cosmology Center (PITT PACC), Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260 (United States)
  2. Brookhaven National Laboratory, Upton, NY 11973 (United States)
Publication Date:
OSTI Identifier:
22280128
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2012; Journal Issue: 04; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCURACY; COMPARATIVE EVALUATIONS; CORRELATIONS; COSMOLOGY; EQUATIONS OF STATE; GRAVITATIONAL COLLAPSE; GRAVITATIONAL LENSES; NONLINEAR PROBLEMS; PHOTOMETRY; RED SHIFT; SHEAR; TOMOGRAPHY

Citation Formats

Hearin, Andrew P., Zentner, Andrew R., and Ma, Zhaoming. General requirements on matter power spectrum predictions for cosmology with weak lensing tomography. United States: N. p., 2012. Web. doi:10.1088/1475-7516/2012/04/034.
Hearin, Andrew P., Zentner, Andrew R., & Ma, Zhaoming. General requirements on matter power spectrum predictions for cosmology with weak lensing tomography. United States. https://doi.org/10.1088/1475-7516/2012/04/034
Hearin, Andrew P., Zentner, Andrew R., and Ma, Zhaoming. 2012. "General requirements on matter power spectrum predictions for cosmology with weak lensing tomography". United States. https://doi.org/10.1088/1475-7516/2012/04/034.
@article{osti_22280128,
title = {General requirements on matter power spectrum predictions for cosmology with weak lensing tomography},
author = {Hearin, Andrew P. and Zentner, Andrew R. and Ma, Zhaoming},
abstractNote = {Forthcoming projects such as DES, LSST, WFIRST, and Euclid aim to measure weak lensing shear correlations with unprecedented precision, constraining the dark energy equation of state at the percent level. Reliance on photometrically-determined redshifts constitutes a major source of uncertainty for these surveys. Additionally, interpreting the weak lensing signal requires a detailed understanding of the nonlinear physics of gravitational collapse. We present a new analysis of the stringent calibration requirements for weak lensing analyses of future imaging surveys that addresses both photo-z uncertainty and errors in the calibration of the matter power spectrum. We find that when photo-z uncertainty is taken into account the requirements on the level of precision in the prediction for the matter power spectrum are more stringent than previously thought. Including degree-scale galaxy clustering statistics in a joint analysis with weak lensing not only strengthens the survey's constraining power by ∼ 20%, but can also have a profound impact on the calibration demands, decreasing the degradation in dark energy constraints with matter power spectrum uncertainty by a factor of 2-5. Similarly, using galaxy clustering information significantly relaxes the demands on photo-z calibration. We compare these calibration requirements to the contemporary state-of-the-art in photometric redshift estimation and predictions of the power spectrum and suggest strategies to utilize forthcoming data optimally.},
doi = {10.1088/1475-7516/2012/04/034},
url = {https://www.osti.gov/biblio/22280128}, journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 04,
volume = 2012,
place = {United States},
year = {2012},
month = {4}
}