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SUMMARY:Extracting cosmological information from weak lensing bispectrum -
  Dipak Munshi (UCL)
DTSTART:20190225T130000Z
DTEND:20190225T140000Z
UID:TALK117397@talks.cam.ac.uk
CONTACT:Daan
DESCRIPTION:I plan to introduce a statistic called the Integrated Bispectr
 um (IB)to probe gravity-induced non-Gaussianity at the level of bispectrum
  from weak lensing maps. I will discuss how to generalize the concept of t
 he IB to spherical coordinates\, and to three-dimensions (3D) using a sphe
 rical-Bessel decomposition. These results will next be connected to the re
 sponse function approach.  I will also introduce the related concept of sq
 ueezed three-point correlation functions (3PCF) for convergence maps  and 
 relate them to the IB defined in the Fourier domain. Next\, I will demonst
 rate how IB can be computed using a variety of analytical approachesinclud
 ing the ones based on Tree-Level Standard Perturbation Theory (SPT)\, Effe
 ctive Field Theory (EFT)\, Halo models and models based on the Separate Un
 iverse approach.\n  Generalization to include tomographic bins\, external 
 data sets\, and Bayesian estimators will be discussed.  I will show result
 s from the Euclid Flagship simulations to test analytical results as a fun
 ction of redshift and wave number. Generalization to shear maps and constr
 uction of squeezed limits of EEE\, BBB\, EEB and EBB bispectra will also b
 e discussed. Finally\, I plan to show how external data sets\, e.g. y-para
 meter maps from thermal Sunyaev-Zel'dovich (tSZ)observations can be used t
 o construct the squeezed limits of mixed IB involving y and convergence fi
 elds.
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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