Extended Limber approximation

Loverde, Marilena; Afshordi, Niayesh

doi:10.1103/physrevd.78.123506

Public

Extended Limber approximation

Published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology • Dec 3, 2008

Authors:

Marilena Loverde

Niayesh Afshordi

Abstract

We develop a systematic derivation for the Limber approximation to the angular cross-power spectrum of two random fields, as a series expansion in $(\ensuremath{\ell}+1/2{)}^{\ensuremath{-}1}$. This extended Limber approximation can be used to test the accuracy of the Limber approximation and to imp...

Subject

Order (exchange)

Orders of approximation

Approximation error

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