Can CMB Lensing Help Cosmic Shear Surveys?
Sudeep Das, Josquin Errard, David Spergel
TL;DR
This paper explores how cross-correlations between CMB lensing, galaxy shear, and galaxy counts can calibrate shear systematics, enhancing the scientific return of future cosmic shear surveys.
Contribution
It demonstrates that CMB lensing cross-correlations can effectively calibrate shear multiplicative bias, improving dark energy and neutrino mass measurements.
Findings
Cross-correlations reduce shear bias uncertainties
Calibration improves constraints on dark energy
Enhances neutrino mass measurement precision
Abstract
Yes! Upcoming galaxy shear surveys have the potential to significantly improve our understanding of dark energy and neutrino mass if lensing systematics can be sufficiently controlled. The cross-correlations between the weak lensing shear, galaxy number counts from a galaxy redshift survey, and the CMB lensing convergence can be used to calibrate the shear multiplicative bias, one of the most challenging systematics in lensing surveys. These cross-correlations can significantly reduce the deleterious effects of the uncertainties in multiplicative bias.
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Taxonomy
TopicsParticle physics theoretical and experimental studies · Radio Astronomy Observations and Technology · Particle Detector Development and Performance