UCSD-2019: Cross-Cut: Delensing

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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


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

  • f_NL
    • Will Coulton on delensing for f_NL
  • 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

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