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Modified gravity N-body code comparison project.

Winther, H. A. and Schmidt, F. and Barreira, A. and Arnold, C. and Bose, S. and Llinares, C. and Baldi, M. and Falck, B. and Hellwing, W. A. and Koyama, K. and Li, B. and Mota, D. F. and Puchwein, E. and Smith, R. and Zhao, G. (2015) 'Modified gravity N-body code comparison project.', Monthly notices of the Royal Astronomical Society., 454 (4). pp. 4208-4234.


Self-consistent N-body simulations of modified gravity models are a key ingredient to obtain rigorous constraints on deviations from general relativity using large-scale structure observations. This paper provides the first detailed comparison of the results of different N-body codes for the f (R), Dvali–Gabadadze–Porrati and Symmetron models, starting from the same initial conditions. We find that the fractional deviation of the matter power spectrum from Λ cold dark matter agrees to better than 1 per cent up to k ∼ 5–10 h Mpc−1 between the different codes. These codes are thus able to meet the stringent accuracy requirements of upcoming observational surveys. All codes are also in good agreement in their results for the velocity divergence power spectrum, halo abundances and halo profiles. We also test the quasi-static limit, which is employed in most modified gravity N-body codes, for the Symmetron model for which the most significant non-static effects among the models considered are expected. We conclude that this limit is a very good approximation for all of the observables considered here.

Item Type:Article
Keywords:Large-scale structure of Universe.
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Publisher statement:This article has been accepted for publication in Monthly notices of the Royal Astronomical Society. ©: 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:25 September 2015
Date deposited:20 November 2015
Date of first online publication:December 2015
Date first made open access:No date available

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