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  On the road to percent accuracy: non-linear reaction of the matter power spectrum to dark energy and modified gravity

Cataneo, M., Lombriser, L., Heymans, C., Mead, A. J., Barreira, A., Bose, S., et al. (2019). On the road to percent accuracy: non-linear reaction of the matter power spectrum to dark energy and modified gravity. Monthly Notices of the Royal Astronomical Society, 488(2), 2121-2142. doi:10.1093/mnras/stz1836.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-C471-F Version Permalink: http://hdl.handle.net/21.11116/0000-0004-C472-E
Genre: Journal Article

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Cataneo, M., Author
Lombriser, L., Author
Heymans, C., Author
Mead, A. J., Author
Barreira, A.1, Author              
Bose, S., Author
Li, B., Author
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1Physical Cosmology, MPI for Astrophysics, Max Planck Society, ou_2205644              

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 Abstract: We present a general method to compute the non-linear matter power spectrum for dark energy (DE) and modified gravity scenarios with per cent-level accuracy. By adopting the halo model and non-linear perturbation theory, we predict the reaction of a lambda cold dark matter (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 non-linear matter power spectrum for a wide range of different w0–wa DE models to better than 1 per cent accuracy out to k ≈ 1 hMpc−1⁠. We obtain a similar performance for both DGP and f(R) gravity, with the non-linear matter power spectrum predicted to better than 3 per cent accuracy over the same range of scales. When including direct measurements of the halo mass function from the simulations, this accuracy improves to 1 per cent. 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 non-linear regime.

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 Dates: 2019-07-04
 Publication Status: Published online
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 Rev. Method: Peer
 Identifiers: DOI: 10.1093/mnras/stz1836
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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
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Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 488 (2) Sequence Number: - Start / End Page: 2121 - 2142 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150