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Modified gravity N-body code comparison project

Winther, H.A.; Schmidt, F.; Barreira, A.; Arnold, C.; Bose, S.; Llinares, C.; Baldi, M.; Falck, B.; Hellwing, W.A.; Koyama, K.; Li, B.; Mota, D.F.; Puchwein, E.; Smith, R.; Zhao, G.

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H.A. Winther

F. Schmidt

A. Barreira

C. Arnold

S. Bose

C. Llinares

M. Baldi

B. Falck

W.A. Hellwing

K. Koyama

D.F. Mota

E. Puchwein

R. Smith

G. Zhao


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.

Journal Article Type Article
Acceptance Date Sep 25, 2015
Publication Date Dec 21, 2015
Deposit Date Aug 17, 2015
Publicly Available Date Nov 20, 2015
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 454
Issue 4
Pages 4208-4234
Keywords Large-scale structure of Universe.
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Published Journal Article (1.8 Mb)

Copyright 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.

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