UMICH-2015: CMB-Lensing break-out session 2

Delensing Details

Blake, ~10 min, File:Delensing.pdf (delensing intro, reviewing delensing performance, internal vs external delensing) Questions for discussion

1. Experiment design
   • Can we combine different experiments, and is it worth having two different noise levels on two experiments (high-res + low-res)

1. Algorithms - Quadratic Estimator / Iterative / Sampling
   • What is the best algorithm to use?
2. Systematics and Delensing
   • Dust foregrounds and sources - how do they propagate through the delensing procedure? How much do they matter?
   • Instrumental systematics, higher order biases, LSS non-Gaussianity - any concerns for delensing?
3. Analysis of Delensed Maps
   • What are the statistical and noise properties of the delensed maps? How to construct likelihoods?

CMB Lensing Cross-correlations

Blake, ~10 min, File:Crosses.pdf

Questions for discussion:

1. weak lensing calibration: cross-correlations with LSST / Euclid / ... weak lensing
   • how precise are the correlations?
   • is this level of multiplicative bias calibration interesting?
   • are intrinsic alignments a limiting factor?
2. clustering from correlations with DESI/Euclid/LSST galaxies / quasars / ...
   • how well can biases be modeled and constrained?
   • can these observables be used cleanly and powerful enough to detect neutrino mass?
   • what are the key science drivers in extragalactic astrophysics?
3. other surveys
   • would overlap with external datasets gain from a northern site?

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