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The imprint of f(R) gravity on weak gravitational lensing II: information content in cosmic shear statistics.

Shirasaki, Masato and Nishimichi, Takahiro and Li, Baojiu and Higuchi, Yuichi (2017) 'The imprint of f(R) gravity on weak gravitational lensing II: information content in cosmic shear statistics.', Monthly notices of the Royal Astronomical Society., 466 (2). pp. 2402-2417.

Abstract

We investigate the information content of various cosmic shear statistics on the theory of gravity. Focusing on the Hu–Sawicki-type f(R) model, we perform a set of ray-tracing simulations and measure the convergence bispectrum, peak counts and Minkowski functionals. We first show that while the convergence power spectrum does have sensitivity to the current value of extra scalar degree of freedom |fR0|, it is largely compensated by a change in the present density amplitude parameter σ8 and the matter density parameter Ωm0. With accurate covariance matrices obtained from 1000 lensing simulations, we then examine the constraining power of the three additional statistics. We find that these probes are indeed helpful to break the parameter degeneracy, which cannot be resolved from the power spectrum alone. We show that especially the peak counts and Minkowski functionals have the potential to rigorously (marginally) detect the signature of modified gravity with the parameter |fR0| as small as 10−5 (10−6) if we can properly model them on small (∼1 arcmin) scale in a future survey with a sky coverage of 1500 deg2. We also show that the signal level is similar among the additional three statistics and all of them provide complementary information to the power spectrum. These findings indicate the importance of combining multiple probes beyond the standard power spectrum analysis to detect possible modifications to general relativity.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1093/mnras/stw3254
Publisher statement:This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:09 December 2016
Date deposited:14 December 2016
Date of first online publication:14 December 2016
Date first made open access:No date available

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