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

Blake - CMB delensing, CMB lensing cross correlated with galaxy surveys, CMB lensing cross correlated with optical weak lensing, parameter forecasts, instrument requirements, survey requirements, systematic challenges (20 min)

Delensing Details

Blake, ~10 min

1. Delensing intro
   • When is delensing necessary?
   • Can external delensing contribute anything?
   • With delensing, what are the tradeoffs in low-resolution noise vs high-resolution noise?
2. Algorithms - Quadratic Estimator / Iterative / Sampling
   • What is the best algorithm to use?
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

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 combination of DESI/Euclid/LSST data
   • how well can biases be modeled and constrained?
   • can dark matter clustering be recovered sufficiently cleanly to, e.g., 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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