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SUMMARY:Formulating Weak Lensing From Boltzmann Equation - Simon Su (DAMTP
 )
DTSTART:20140217T130000Z
DTEND:20140217T140000Z
UID:TALK50656@talks.cam.ac.uk
CONTACT:Camille Bonvin
DESCRIPTION:The CMB weak lensing is a nonlinear effect and contributes sig
 nificantly to CMB power spectra\, bispectra and trispectra. An accurate ca
 lculation of the lensing effect is crucial for studying the late-time evol
 ution of the universe and eliminating contaminations from the primordial s
 ignals of inflation. Currently\, the lensing effect is calculated by the r
 emapping approach which can be derived through the geodesic equations. In 
 this talk\, I will demonstrate a novel and systematic approach to formulat
 e the lensing effect through the Boltzmann equation in arbitrarily high or
 der. This approach identifies explicitly the approximations implied in the
  remapping approach and helps to assess the approximations. Moreover\, I w
 ill apply the formalism to study the lens-lens couplings on the temperatur
 e power spectrum.
LOCATION:CMS\, Pav. B\, CTC Common Room (B1.19) [Potter Room]
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