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CATEGORIES:Cosmology Lunch
SUMMARY:Extracting cosmological information from weak lens
ing bispectrum - Dipak Munshi (UCL)
DTSTART;TZID=Europe/London:20190225T130000
DTEND;TZID=Europe/London:20190225T140000
UID:TALK117397AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/117397
DESCRIPTION:I plan to introduce a statistic called the Integra
ted Bispectrum (IB)to probe gravity-induced non-Ga
ussianity at the level of bispectrum from weak len
sing maps. I will discuss how to generalize the co
ncept of the IB to spherical coordinates\, and to
three-dimensions (3D) using a spherical-Bessel dec
omposition. These results will next be connected t
o the response function approach. I will also int
roduce the related concept of squeezed three-point
correlation functions (3PCF) for convergence maps
and relate them to the IB defined in the Fourier
domain. Next\, I will demonstrate how IB can be c
omputed using a variety of analytical approachesin
cluding the ones based on Tree-Level Standard Pert
urbation Theory (SPT)\, Effective Field Theory (EF
T)\, Halo models and models based on the Separate
Universe approach.\n Generalization to include to
mographic bins\, external data sets\, and Bayesian
estimators will be discussed. I will show result
s from the Euclid Flagship simulations to test ana
lytical results as a function of redshift and wave
number. Generalization to shear maps and construc
tion of squeezed limits of EEE\, BBB\, EEB and EBB
bispectra will also be discussed. Finally\, I pla
n to show how external data sets\, e.g. y-paramete
r maps from thermal Sunyaev-Zel'dovich (tSZ)observ
ations can be used to construct the squeezed limit
s of mixed IB involving y and convergence fields.
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Roo
m]
CONTACT:Daan
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