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

From CMB-S4 wiki
Jump to navigationJump to search
Line 5: Line 5:
 
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?
#*Systematics and Delensing
+
#Systematics and Delensing
#**Dust foregrounds and sources - how do they propagate through the delensing procedure? How much do they matter?
+
#*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?
+
#*Instrumental systematics, higher order biases, LSS non-Gaussianity - any concerns for delensing?
#*Analysis of Delensed Maps
+
#Analysis of Delensed Maps
#**What are the statistical and noise properties of the delensed maps? How to construct likelihoods?
+
#*What are the statistical and noise properties of the delensed maps? How to construct likelihoods?
  
 
==CMB Lensing Cross-correlations==
 
==CMB Lensing Cross-correlations==

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

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

File:Delens.pdf Questions for discussion

  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

  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?

Wiki navigation

Return to main workshop page

Return to CMB-Lensing sessions page