Weak lensing B-modes on all scales as a probe of local isotropy

Details Weak lensing B-modes on all scales as a probe of local isotropy Weak lensing B-modes on all scales as a probe of local isotropy

2012-03-27

arxiv.org/abs/1203.6029v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

4 pages, 1 figure

Scientific paper

This article derives a multipolar hierarchy for the propagation of the weak-lensing shear and convergence in a general spacetime. The origin of B-modes, in particular on large angular scales, is related to the local isotropy of space. Known results assuming a Friedmann-Lema\^itre background are naturally recovered. The example of a Bianchi I spacetime illustrates our formalism and its implications for future observations are stressed.

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