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SUMMARY:Relativistic effects in weak gravitational lensing - Camille Bonvi
 n\, Institute of Astronomy\, Cambridge
DTSTART:20110314T160000Z
DTEND:20110314T170000Z
UID:TALK30253@talks.cam.ac.uk
CONTACT:Sijme-Jan Paardekooper
DESCRIPTION:Future lensing surveys aim at observing almost the whole sky. 
 They will measure lensing correlations at very large scales. At those scal
 es\, new relativistic effects will come into play and open the way to new 
 type of studies. In this talk\, I will present a fully relativistic calcul
 ation of weak gravitational lensing up to second order in the gravitationa
 l potential. First\, I will show that the convergence part of weak lensing
  contains new effects that are neglected at small scales. I will show that
  one of these contributions\, generated by peculiar velocities of galaxies
 \, becomes important at large scales. At small redshifts\, it has an obser
 vable impact on the convergence power spectrum. Then I will present a calc
 ulation of the shear part of weak lensing up to second order. I will show 
 that at large scales various non-linear couplings appear that can potentia
 lly provide new tests of gravity.\n
LOCATION:MR14\, DAMTP\, Pav. F
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