Toward General Relativistic Cosmological N-body Simulations

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• David Daverio (University of Cambridge)
• Friday 17 May 2019, 13:00-14:00
• Pavilion B Potter Room (B1.19).

If you have a question about this talk, please contact Nathan Johnson-McDaniel.

Cosmological n-body simulation are usually based on a Newtonian treatment of gravity. The forthcoming large scale structure surveys will allow to reach sub-percent precision and therefore relativistic effect could become relevant. This motivated the development of the first relativistic n-body code, gevolution. However, if the gevolution code is based on a metric formulation of gravity, it still work in a perturbative approach, the weak field expansion. Therefore one could argue (and some do) that gevolution cannot capture purely non-linear effects. This motivates the development of cosmological codes based on numerical relativity (NR). In this talk, the first NR n-body code able to evolve a pure dark matter universe from redshift 1000 to 0 will be presented. The difficulties of generating good initial condition will be discussed, with a special attention on the momentum constraint.

This talk is part of the DAMTP Friday GR Seminar series.

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