10.1093-mnras-stv2253.pdf (1.74 MB)
Modified gravity N-body code comparison project
journal contribution
posted on 2023-06-09, 02:24 authored by Hans A Winther, Fabian Schmidt, Alexandre Barreira, Christian Arnold, Sownak Bose, Claudio Llinares, Marco Baldi, Bridget Falck, Wojciech A Hellwing, Kazuya Koyama, Baojiu Li, David F Mota, Ewald Puchwein, Robert E SmithRobert E Smith, Gong-Bo ZhaoSelf-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 Lambda 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.
Funding
TB002-46; Dept P&A
History
Publication status
- Published
File Version
- Published version
Journal
Monthly Notices of the Royal Astronomical SocietyISSN
0035-8711Publisher
Oxford University PressExternal DOI
Issue
4Volume
454Page range
4208-4234Department affiliated with
- Physics and Astronomy Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2016-08-05First Open Access (FOA) Date
2016-08-05First Compliant Deposit (FCD) Date
2016-08-05Usage metrics
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