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.
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.
|Full text:||(AM) Accepted Manuscript|
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|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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