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

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#*Can we combine different experiments, and is it worth having two different noise levels on two experiments (high-res + low-res) [[File:new.png|500px]] | #*Can we combine different experiments, and is it worth having two different noise levels on two experiments (high-res + low-res) [[File:new.png|500px]] | ||

#Algorithms - Quadratic Estimator / Iterative / Sampling | #Algorithms - Quadratic Estimator / Iterative / Sampling | ||

− | #*What is the best algorithm to use? [[File:new2.png | + | #*What is the best algorithm to use? [[File:new2.png]] |

#*How low ell do we use/need for reconstruction? | #*How low ell do we use/need for reconstruction? | ||

#Systematics and Delensing | #Systematics and Delensing |

## Revision as of 18:22, 20 September 2015

## Delensing Details

Blake, ~10 min, File:Delensing.pdf (delensing intro, reviewing delensing performance, internal vs external delensing) Questions for discussion

- Experiment design
- Algorithms - Quadratic Estimator / Iterative / Sampling
- 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, File:Crosses.pdf

Questions for discussion:

- 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?

- 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?

- other surveys
- would overlap with external datasets gain from a northern site?