UCSD-2019: Cross-Cut: Delensing

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Charge

General charge to all parallels:

We need to use the October collaboration meeting to advance our preparations for CD-1. Right away, we need to:

• Identify key decisions that must be made (and justified) prior to CD-1,
• Make progress on (or actually make) those decisions,
• Lay out a timeline and process for making each decision, consistent with the post-decision work and internal reviews that will be needed to complete preparations for CD-1,
• Ensure that those timelines and processes are understood and supported by the collaboration, and that we (together) believe we can follow them.

Specific charge to this delensing cross-cut session:

• For the de-lensing LAT, what are the benefits and costs of variation in angular resolution (dish size) for legacy survey science goals?
• What is minimum dish size / throughput needed for delensing? Would multiple smaller telescopes be better than one bigger one? (both r + Neff)
• What are the effects of foregrounds on delensing (both for r and Neff)

Remote Attendance

Zoom link

Agenda

1) On-going work related to delensing (50 min - 1hr):

• Foregrounds
  • Marius Millea on incorporating foregrounds in Bayesian delensing
  • Anton Baleato Lizancos on biases to delensing from CIB and EB estimator
  • DW Han and Alex van Engelen on Galactic foreground impacts
  • Kimmy Wu on CIB non-Gaussianity impacts on delensed bandpower covariances
• N_eff
  • Selim Hotinli on delensing for N_eff
• f_NL
  • Will Coulton on delensing for f_NL

2) What are some of the questions that need answering for moving CMB-S4 to CD-1 readiness in delensing (1hr):

• How map non-idealities impact delensing efficiency (Toshiya Namikawa)
• Instrument effects (Kimmy Wu)
• What inputs are needed in order to address session charges