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

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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) New.png
  2. Algorithms - Quadratic Estimator / Iterative / Sampling
    • What is the best algorithm to use? New2.png
    • How low ell do we use/need for reconstruction?
  3. 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?
  4. 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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