paper

Weak lensing "post-Born" effects are equivalent to pure lens-lens couplings

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Published 25 August 2022 © 2022 IOP Publishing Ltd and Sissa Medialab
, , Citation Oliver Denton-Turner and Eugene A. Lim JCAP08(2022)053 DOI 10.1088/1475-7516/2022/08/053

1475-7516/2022/08/053

Abstract

We show that the so-called "post-Born" effects of weak lensing at 4th order are equivalent to lens-lens couplings in the Born Approximation. We demonstrate this by explicitly showing the equivalence of the canonical weak lensing approach at 4th order using the anisotropy remapping method, to that of the 4th order calculation of the lens-lens coupling effects using the Boltzmann equation approach that was first developed in [1].

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10.1088/1475-7516/2022/08/053