UMICH-2015: Inflation break-out session 1

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B-modes challenges: foregrounds and de-lensing

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Foregrounds

  • 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)
  • 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

  • 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?


Delensing

(Blake Sherwin, Olivier Dore, Chris Sheehy, Josquin Errard, Stephen Feeney, Alex van Engelen, Neelima Sehgal, Anthony Challinor...)

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)?

  • 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?

  • Blake: need high sensitivity lensing map

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