Wednesday, March 28, 2012

1203.6029 (Cyril Pitrou et al.)

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

Cyril Pitrou, Jean-Philippe Uzan, Thiago S. Pereira
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.
View original: http://arxiv.org/abs/1203.6029

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