Difference between revisions of "UMICH-2015: CMB-Lensing break-out session 2"

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==Delensing Details==
 
==Delensing Details==
 
Blake, ~10 min
 
Blake, ~10 min
#Delensing intro
+
Delensing intro
 
#*When is delensing necessary?
 
#*When is delensing necessary?
 
#*Can external delensing contribute anything?
 
#*Can external delensing contribute anything?
 
#*With delensing, is it worth having different noise levels on two different experiments (high and low-resolution)?
 
#*With delensing, is it worth having different noise levels on two different experiments (high and low-resolution)?
 
[[File:delens.pdf]]
 
[[File:delens.pdf]]
#Questions for discussion
+
Questions for discussion
 
#*Algorithms - Quadratic Estimator / Iterative / Sampling
 
#*Algorithms - Quadratic Estimator / Iterative / Sampling
 
#**What is the best algorithm to use?
 
#**What is the best algorithm to use?

Revision as of 17:40, 19 September 2015

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 Delensing intro

    • When is delensing necessary?
    • Can external delensing contribute anything?
    • With delensing, is it worth having different noise levels on two different experiments (high and low-resolution)?

File:Delens.pdf Questions for discussion

    • Algorithms - Quadratic Estimator / Iterative / Sampling
      • What is the best algorithm to use?
    • 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?
    • 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 correlations with 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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