Difference between revisions of "UMICH-2015: Inflation break-out session 1"

From CMB-S4 wiki
Jump to navigationJump to search
 
(32 intermediate revisions by the same user not shown)
Line 1: Line 1:
 
==Wiki navigation==
 
==Wiki navigation==
 
'''B-modes challenges: foregrounds and de-lensing'''
 
  
 
[[Cosmology with CMB-S4|Return to main workshop page]]
 
[[Cosmology with CMB-S4|Return to main workshop page]]
Line 7: Line 5:
 
[[UMICH-2015: Inflation|Return to Inflation sessions page]]
 
[[UMICH-2015: Inflation|Return to Inflation sessions page]]
  
 +
=B-modes challenges: foregrounds and de-lensing=
  
===Foregrounds===
+
==[[UMICH-2015:ChallengeForegrounds|Foregrounds log-book]]==
 
*What are our latest estimates of foreground levels post-Planck?
 
*What are our latest estimates of foreground levels post-Planck?
*What simulations and tools do we have for forecasting impact on r?
+
*What simulations and tools do we have for forecasting impact on r? (details for Tuesday, also incl delensing)
 
*What are still physical unknowns?
 
*What are still physical unknowns?
*Do we need new data at  <40 GHz and >230 GHz?
+
*Do we need new data at  <40 GHz and >230 GHz? (and 60 GHz?)
 
*How important is large sky area?
 
*How important is large sky area?
 +
*What is the path to a convincing claim that a B-mode signal is not foregrounds?
  
===Delensing===
+
==[[UMICH-2015:ChallengeDelensing|Delensing logbook]]==
*What is the impact of delensing on r, and on nt?
+
*What is the impact of delensing on r, and on nt or BB wiggles?
*How does internal CMB delensing compare to external (e.g. CIB)?
 
*What sensitivity and resolution do we need for the lensing map?
 
----
 
 
 
===Foregrounds===
 
 
 
*What are our latest estimates of foreground levels post-Planck? (Steve, Raphael...)
 
 
 
Figure from Steve Choi/Lyman Page:
 
 
 
[[File:choi.png|700px]]
 
 
 
Can we make a new version of this figure:
 
 
 
[[File:oldFG.png|500px]]
 
 
 
----
 
 
 
*What simulations and tools do we have for forecasting impact on r? (Jacques, Raphael, Stephen F, Aurelien, Jo)
 
 
 
Is there a new PSM? Common sim maps would be great.
 
 
 
-----
 
*What are still physical unknowns? (Al Kogut?)
 
 
 
Magnetic dust, spinning dust polarization, spatial dispersion of dust temperature/emissivity...
 
 
 
From Planck, dispersion in dust index between individual 300 deg2 patches is about +-0.15 and varies between beta = 1.1 and 2.2.
 
-----
 
*Do we need new data at <40 GHz and >230-300 GHz? (Clem/John?, Mark)
 
 
 
The effective polarized noise from cleaning 150 GHz with Planck 353 GHz  is about 19 uK-arcmin, i.e. an additional sigma(r) ~0.01 for fsky=0.2
 
 
 
[[File:index.png|500px]]
 
 
 
-----
 
*How important is large sky area?
 
 
 
-----
 
 
 
===Delensing===  
 
(Blake Sherwin, Olivier Dore, Chris Sheehy, Josquin Errard, Stephen Feeney, Alex van Engelen, Neelima Sehgal...)
 
 
 
*What is the impact of delensing on r, and on nt?  
 
 
 
-----
 
*How does internal CMB delensing compare to external (e.g. CIB)?
 
 
 
Blake says external cleaning won't be good enough for 1 uK noise levels.
 
-----
 
 
*What sensitivity and resolution do we need for the lensing map?
 
*What sensitivity and resolution do we need for the lensing map?
 
+
*What are the frequency/foreground-removal requirements for the lensing map?
-----
+
*How low a multipole is needed for the lensing-extraction-map?

Latest revision as of 16:35, 20 September 2015

Wiki navigation

Return to main workshop page

Return to Inflation sessions page

B-modes challenges: foregrounds and de-lensing

Foregrounds log-book

  • What are our latest estimates of foreground levels post-Planck?
  • What simulations and tools do we have for forecasting impact on r? (details for Tuesday, also incl delensing)
  • What are still physical unknowns?
  • Do we need new data at <40 GHz and >230 GHz? (and 60 GHz?)
  • How important is large sky area?
  • What is the path to a convincing claim that a B-mode signal is not foregrounds?

Delensing logbook

  • What is the impact of delensing on r, and on nt or BB wiggles?
  • What sensitivity and resolution do we need for the lensing map?
  • What are the frequency/foreground-removal requirements for the lensing map?
  • How low a multipole is needed for the lensing-extraction-map?