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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

Cyril Pitrou , Jean-Philippe Uzan , Thiago S. Pereira This is my paper · ORCID
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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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Cited by 2 Pith papers

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  1. Tetrad formalism for exact cosmological observables

    astro-ph.CO 2019-08 accept novelty 7.0 of 10

    The paper derives exact, coordinate-independent equations for cosmological observables on a new 'observer space-time' manifold, using tetrads to track the observer frame.

  2. Probing the Cosmological Principle with weak lensing shear

    astro-ph.CO 2024-11 conditional novelty 4.0 of 10

    A Euclid-like weak lensing survey could detect the E-B shear cross-correlation produced by late-time anisotropic expansion, yielding a new probe of the Cosmological Principle.

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