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

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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==
 +
[[File:delensing.pdf]]
  
==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
 
Questions for discussion
#*Algorithms - Quadratic Estimator / Iterative / Sampling
+
#Experiment design
#**What is the best algorithm to use?
+
#*Can we combine different experiments, and is it worth having two different noise levels on two experiments (high-res + low-res)
#*Systematics and Delensing
+
#Algorithms - Quadratic Estimator / Iterative / Sampling
#**Dust foregrounds and sources - how do they propagate through the delensing procedure? How much do they matter?
+
#*What is the best algorithm to use?
#**Instrumental systematics, higher order biases, LSS non-Gaussianity - any concerns for delensing?
+
#*How low ell do we use/need for reconstruction?
#*Analysis of Delensed Maps
+
#Systematics and Delensing
#**What are the statistical and noise properties of the delensed maps? How to construct likelihoods?
+
#*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==
 
==CMB Lensing Cross-correlations==
Blake, ~10 min
+
[[File:crosses.pdf]]
 
+
#weak lensing calibration: cross-correlations with LSST / Euclid weak lensing
+
Questions for discussion:
 +
#weak lensing calibration: cross-correlations with LSST / Euclid / ... weak lensing
 
#*how precise are the correlations?
 
#*how precise are the correlations?
 
#*is this level of multiplicative bias calibration interesting?
 
#*is this level of multiplicative bias calibration interesting?
 
#*are intrinsic alignments a limiting factor?
 
#*are intrinsic alignments a limiting factor?
#clustering from correlations with DESI/Euclid/LSST data
+
#clustering from correlations with DESI/Euclid/LSST galaxies / quasars / ...
 
#*how well can biases be modeled and constrained?
 
#*how well can biases be modeled and constrained?
#*can dark matter clustering be recovered sufficiently cleanly to, e.g., detect neutrino mass?
+
#*can these observables be used cleanly and powerful enough to detect neutrino mass?
 
#*what are the key science drivers in extragalactic astrophysics?
 
#*what are the key science drivers in extragalactic astrophysics?
 
#other surveys
 
#other surveys
 
#*would overlap with external datasets gain from a northern site?
 
#*would overlap with external datasets gain from a northern site?
 +
#*is there a way to make use of cross-correlations with Ly-alpha or intensity mapping, or are the modes they probe too different?
 +
#*prospects and challenges for cluster mass calibration with CMB lensing?
  
 
==Wiki navigation==
 
==Wiki navigation==

Latest revision as of 08:52, 22 September 2015

Delensing Details

File:Delensing.pdf

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)
  2. Algorithms - Quadratic Estimator / Iterative / Sampling
    • What is the best algorithm to use?
    • 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

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?
    • is there a way to make use of cross-correlations with Ly-alpha or intensity mapping, or are the modes they probe too different?
    • prospects and challenges for cluster mass calibration with CMB lensing?

Wiki navigation

Return to main workshop page

Return to CMB-Lensing sessions page