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SUMMARY:CMB lensing and delensing with low-noise polarization data - Julie
 n Carron (Geneva)
DTSTART:20230130T130000Z
DTEND:20230130T140000Z
UID:TALK196090@talks.cam.ac.uk
CONTACT:Dr  Dong-Gang Wang
DESCRIPTION:For CMB polarization noise well below the lensing $B$-power\, 
 methods more powerful but more complex than quadratic estimators must be u
 sed in order to achieve best recovery of the CMB lensing signal. This is p
 articularly relevant for example for deep (CMB-S4 like) experiments aimed 
 at constraining the primordial gravitational wave background from inflatio
 n\, or for tightest constraints on neutrino masses and other parameters fr
 om the lensing spectrum. I will discuss the maximum a posteriori reconstru
 ction method we have been developing in Geneva\, and its applications to '
 somewhat realistic' CMB-S4 delensing and r-constraints\, as well as the es
 timation of the lensing power spectrum in this regime. At CMB-S4 depth the
  lensing post-Born curl mode becomes a signal\, and I'll discuss its optim
 al internal joint reconstruction with the lensing gradient.
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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