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The modified gravity light-cone simulation project – I. Statistics of matter and halo distributions.

Arnold, Christian and Fosalba, Pablo and Springel, Volker and Puchwein, Ewald and Blot, Linda (2019) 'The modified gravity light-cone simulation project – I. Statistics of matter and halo distributions.', Monthly notices of the Royal Astronomical Society., 483 (1). pp. 790-805.

Abstract

We introduce a set of four very high resolution cosmological simulations exploring f(R) gravity, with 20483 particles in 768 and 1536h−1Mpc simulation boxes, for |f¯R0|=10−5 and Λ cold dark matter (ΛCDM), making the set the largest simulations of f(R) gravity to date. To mimic real observations, the simulations include a continuous 2D- and 3D-light-cone output dedicated to study lensing and clustering statistics. We present a detailed analysis and resolution study for the matter power spectrum in f(R) gravity over a wide range of scales. We also analyse the angular matter power spectrum and lensing convergence on the light-cone. In addition, we investigate the impact of modified gravity on the halo mass function, matter, and halo autocorrelation functions, linear halo bias, and the concentration–mass relation. The impact of f(R) gravity is generally larger on smaller scales and smaller redshift. Comparing our simulations to state-of-the-art hydrodynamical simulations, we confirm a degeneracy between f(R) gravity and baryonic feedback in the matter power spectrum on small scales, but also find that scales around k=1hMpc−1 are promising to distinguish both effects. The lensing convergence power spectrum is increased in f(R) gravity. Numerical fits are in good agreement with our simulations for both standard and modified gravity, but tend to overestimate their relative difference on non-linear scales. The halo bias is lower in f(R) gravity, whereas halo concentrations are increased for unscreened haloes.

Item Type:Article
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1093/mnras/sty3044
Publisher statement:© 2019 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society.
Date accepted:05 November 2018
Date deposited:11 April 2019
Date of first online publication:10 November 2018
Date first made open access:11 April 2019

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