Jena 2013 – scientific programme

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GR: Fachverband Gravitation und Relativitätstheorie

GR 14: Kosmologie II

GR 14.2: Talk

Thursday, February 28, 2013, 16:45–17:00, HS 6

Newtonian N-body simulations are compatible with cosmological perturbation theory — •Thomas Haugg, Stefan Hofmann, and Michael Kopp — LMU Munich

We elaborate on the recent claim (Flender & Schwarz 2012) that Newtonian N-body simulations of collisionless Dark Matter in a LambdaCDM background are inaccurate on scales larger than 10 Mpc due to general relativistic effects at the linear level. We find that at the 10 Mpc scale these effects are indeed important, however are well known as gravitational lensing. At even larger scales all relativistic corrections can in general become equal in size. Using Bardeen variables we give a dictionary for how to use Newtonian N-body simulation data to correctly evaluate these general relativistic terms at all scales where linear perturbation theory applies, in particular at scales larger than 10 Mpc up to arbitrary large scales.