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

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Barreira,  A.
Physical Cosmology, MPI for Astrophysics, Max Planck Society;

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Citation

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.


Cite as: http://hdl.handle.net/21.11116/0000-0004-C471-F
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.