Journal Article

Information content in the angular power spectrum of weak lensing: wavelet method

Hao-Ran Yu, Joachim Harnois-Déraps, Tong-Jie Zhang and Ue-Li Pen

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 421, issue 1, pages 832-840
Published in print March 2012 | ISSN: 0035-8711
Published online March 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.20360.x
Information content in the angular power spectrum of weak lensing: wavelet method

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We quantify the performance of a non-linear Wiener filter, constructed in wavelet space, at recovering some of the Fisher information that was lost in the weak lensing convergence field. The proposed method consists of a separation of the original field into the sum of a Gaussian and a non-Gaussian contribution. After filtering an ensemble of such fields, which are obtained from N-body simulations, we find that we can recapture about four times more Fisher information, an effect that can potentially improve by a significant amount the constraining power of weak lensing surveys on cosmological parameters, including the dark energy equation of state ω. We compare this performance with that of a logarithmic mapping and find that the wavelet method can recover up to three times more information.

Keywords: gravitational lensing: weak; methods: statistical; cosmology: theory; dark matter

Journal Article.  5984 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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