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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; Lombriser, Lucas; Heymans, Catherine; Mead, Alexander; Barreira, Alexandre; Bose, Sownak; Li, Baojiu

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


Authors

Matteo Cataneo

Lucas Lombriser

Catherine Heymans

Alexander Mead

Alexandre Barreira

Sownak Bose



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.

Journal Article Type Article
Acceptance Date Jun 10, 2019
Online Publication Date Jul 4, 2019
Publication Date Aug 30, 2019
Deposit Date Jun 17, 2019
Publicly Available Date Jul 16, 2019
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 488
Issue 2
Pages 2121-2142
DOI https://doi.org/10.1093/mnras/stz1836
Public URL https://durham-repository.worktribe.com/output/1299155
Related Public URLs https://arxiv.org/abs/1812.05594

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Copyright 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.






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