Matter power spectrum and the challenge of percent accuracy
Future galaxy surveys require one percent precision in the theoretical knowledge of the power spectrum over a large range including very nonlinear scales. While this level of accuracy is easily obtained in the linear regime with perturbation theory, it represents a serious challenge for small scales...
Gespeichert in:
| Hauptverfasser: | , |
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| Dokumenttyp: | Article (Journal) Kapitel/Artikel |
| Sprache: | Englisch |
| Veröffentlicht: |
2016
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| In: |
Arxiv
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| Online-Zugang: | Verlag, kostenfrei, Volltext: http://arxiv.org/abs/1503.05920
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| Verfasserangaben: | Aurel Schneider, Romain Teyssier, Doug Potter, Joachim Stadel, Julian Onions, Darren S. Reed, Robert E. Smith, Volker Springel, Frazer R. Pearce, and Roman Scoccimarro |
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| 245 | 1 | 0 | |a Matter power spectrum and the challenge of percent accuracy |c Aurel Schneider, Romain Teyssier, Doug Potter, Joachim Stadel, Julian Onions, Darren S. Reed, Robert E. Smith, Volker Springel, Frazer R. Pearce, and Roman Scoccimarro |
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| 520 | |a Future galaxy surveys require one percent precision in the theoretical knowledge of the power spectrum over a large range including very nonlinear scales. While this level of accuracy is easily obtained in the linear regime with perturbation theory, it represents a serious challenge for small scales where numerical simulations are required. In this paper we quantify the precision of present-day $N$-body methods, identifying main potential error sources from the set-up of initial conditions to the measurement of the final power spectrum. We directly compare three widely used $N$-body codes, Ramses, Pkdgrav3, and Gadget3 which represent three main discretisation techniques: the particle-mesh method, the tree method, and a hybrid combination of the two. For standard run parameters, the codes agree to within one percent at $k\leq1$ | ||
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