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

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arxiv 1203.6029 v3 pith:7USBIDPO submitted 2012-03-27 astro-ph.CO gr-qc

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

classification astro-ph.CO gr-qc
keywords b-modesisotropylocalscalesspacetimeangulararticleassuming
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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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