Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-02-22
Astrophys.J.574:19,2002
Astronomy and Astrophysics
Astrophysics
4 pages, 1 figure, submitted to ApJL
Scientific paper
10.1086/340892
We calculate corrections to the power spectrum predictions of weak lensing by large scale structure due to higher order effects in the gravitational potential. Using a perturbative approach to third order in transverse displacements, we calculate a second order correction to the angular power spectra of E and B mode shear and convergence resulting from dropping the so-called Born approximation, where one integrates along the unperturbed photon path. We also consider a correction to the power spectra from the coupling between lenses at different redshifts. Both effects generate B-mode shear and the latter also causes a net rotation of the background galaxy images. We show all these corrections are at least two orders of magnitude below the convergence or E-mode power and hence relevant only to future ultra high precision measurements. These analytical calculations are consistent with previous numerical estimates and validate the use of current large scale structure weak lensing predictions for cosmological studies and future use of B-modes as a monitor of systematic effects.
Cooray Asantha
Hu Wayne
No associations
LandOfFree
Second Order Corrections to Weak Lensing by Large-Scale Structure does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Second Order Corrections to Weak Lensing by Large-Scale Structure, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Second Order Corrections to Weak Lensing by Large-Scale Structure will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-339762