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On the road to percent accuracy : nonlinear reaction of the matter power spectrum to dark energy and modified gravity.

Cataneo, Matteo and Lombriser, Lucas and Heymans, Catherine and Mead, Alexander and Barreira, Alexandre and Bose, Sownak and Li, Baojiu (2019) 'On the road to percent accuracy : nonlinear reaction of the matter power spectrum to dark energy and modified gravity.', Monthly notices of the Royal Astronomical Society., 488 (2). pp. 2121-2142.

Abstract

We present a general method to compute the nonlinear matter power spectrum for dark energy and modified gravity scenarios with percent-level accuracy. By adopting the halo model and nonlinear perturbation theory, we predict the reaction of a ΛCDM matter power spectrum to the physics of an extended cosmological parameter space. By comparing our predictions to N-body simulations we demonstrate that with no-free parameters we can recover the nonlinear matter power spectrum for a wide range of different w0-wa dark energy models to better than 1% accuracy out to k ≈ 1 h Mpc−1. We obtain a similar performance for both DGP and f(R) gravity, with the nonlinear matter power spectrum predicted to better than 3% accuracy over the same range of scales. When including direct measurements of the halo mass function from the simulations, this accuracy improves to 1%. With a single suite of standard ΛCDM N-body simulations, our methodology provides a direct route to constrain a wide range of non-standard extensions to the concordance cosmology in the high signal-to-noise nonlinear regime.

Item Type:Article
Full text:(AM) Accepted Manuscript
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1093/mnras/stz1836
Publisher statement:This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. ©: 2019 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:10 June 2019
Date deposited:16 July 2019
Date of first online publication:04 July 2019
Date first made open access:No date available

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