期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 488, 期 2, 页码 2121-2142出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stz1836
关键词
methods: analytical; large-scale structure of Universe; cosmology: theory
资金
- European Research Council [ERC-StG-716532-PUNCA]
- Swiss National Science Foundation (SNSF) Professorship grant [170547]
- SNSF Advanced Postdoc [161058]
- Science and Technology Facilities Council Consolidated Grant for Astronomy and Astrophysics at the University of Edinburgh
- Affiliate programme of the Higgs Centre for Theoretical Physics
- European Union [702971, MDM-2014-0369]
- Harvard University through the ITC Fellowship
- UK STFC [ST/P000541/1, ST/L00075X/1]
- BIS National E-infrastructure capital grant [ST/K00042X/1]
- STFC capital grants [ST/H008519/1, ST/K00087X/1]
- STFCDiRAC Operations grant [ST/K003267/1]
- Durham University
- Marie Curie Actions (MSCA) [702971] Funding Source: Marie Curie Actions (MSCA)
- STFC [ST/R001006/1, ST/P000541/1, ST/M007073/1, ST/M006948/1, ST/R001014/1, ST/T001569/1, ST/T001348/1, ST/T001550/1, ST/M007065/1, ST/S002529/1, ST/T001372/1, ST/R00689X/1, ST/K00042X/1, ST/L00075X/1, ST/R000832/1, ST/H008519/1, ST/M007618/1, ST/R001049/1, ST/M007006/1] Funding Source: UKRI
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 (Lambda CDM) 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 w(0)-w(a) DE models to better than 1 per cent accuracy out to k approximate to 1 h Mpc(-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 Lambda CDM 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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