Matteo Cataneo
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
Authors
Lucas Lombriser
Catherine Heymans
Alexander Mead
Alexandre Barreira
Sownak Bose
Professor Baojiu Li baojiu.li@durham.ac.uk
Professor
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.
Citation
Cataneo, M., Lombriser, L., Heymans, C., Mead, A., Barreira, A., Bose, S., & Li, B. (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), 2121-2142. https://doi.org/10.1093/mnras/stz1836
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 | Mar 28, 2024 |
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 |
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.
Published Journal Article
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