Erlangen 2026 – scientific programme
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GR: Fachverband Gravitation, Relativistische Astrophysik und Kosmologie
GR 19: Numerical Relativity III
GR 19.3: Talk
Friday, March 20, 2026, 11:30–11:45, KH 02.012
Numerical relativity with NRPy+ and deal.ii — •Göran Ratz1,2 and Frank Ohme1,2 — 1Max Planck Institute for Gravitational Physics, Hannover, Germany — 2Leibniz University Hannover, Hannover, Germany
Numerical Relativity has been an insightful and irreplaceable part of understanding the nonlinear dynamics of spacetime. It is also known for being a little inaccessible mainly due to its magnificent computational costs and specialisation. In my talk, I want to give a brief introduction to NRPy+ (https://nrpyplus.net/), a well documented and beginner-friendly NR python library which makes, by some smart coordinate choices, certain black-hole merger simulations accessible for the "everyday user". I will also discuss the application of the C++ FEM-library deal.ii (https://dealii.org/) for generating Bowen-York-Brandt-Brügmann initial data slices for numerical relativity.
Keywords: Numerical relativity; Black holes; initial data; finite element method