gevolution: a cosmological N-body code based on General Relativity
- Laboratoire Univers et Théories – UMR 8102, Observatoire de Paris, 5 Place Jules Janssen, 92195 Meudon CEDEX (France)
- African Institute for Mathematical Sciences, 6 Melrose Road, Muizenberg 7945 (South Africa)
- Département de Physique Théorique and Center for Astroparticle Physics, Université de Genève, 24 Quai E. Ansermet, 1211 Genève 4 (Switzerland)
We present a new N-body code, gevolution , for the evolution of large scale structure in the Universe. Our code is based on a weak field expansion of General Relativity and calculates all six metric degrees of freedom in Poisson gauge. N-body particles are evolved by solving the geodesic equation which we write in terms of a canonical momentum such that it remains valid also for relativistic particles. We validate the code by considering the Schwarzschild solution and, in the Newtonian limit, by comparing with the Newtonian N-body codes Gadget-2 and RAMSES . We then proceed with a simulation of large scale structure in a Universe with massive neutrinos where we study the gravitational slip induced by the neutrino shear stress. The code can be extended to include different kinds of dark energy or modified gravity models and going beyond the usually adopted quasi-static approximation. Our code is publicly available.
- OSTI ID:
- 22679566
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2016, Issue 07; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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