Erlangen 2026 – scientific programme

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GR: Fachverband Gravitation, Relativistische Astrophysik und Kosmologie

GR 19: Numerical Relativity III

GR 19.1: Talk

Friday, March 20, 2026, 11:00–11:15, KH 02.012

Improved Moving-Puncture Techniques for Binary Black-Hole Simulations — •Linsheng Li — Institut für Theoretische Physik, Goethe Universität, Frankfurt am Main, Germany

To fully exploit current and upcoming gravitational-wave observations, accurate numerical-relativity simulations of compact binaries require tight control of constraint violations in moving-puncture evolutions. We present a moving-puncture scheme in the CCZ4 formulation within the Einstein Toolkit that incorporates both a slow-start lapse (SSL) condition and a curvature-adjusted Hamiltonian-constraint damping (CAHD) prescription, aimed at reducing constraint violations and improving the quality of the extracted waveforms. By exploiting the constraint-propagation and damping properties of CCZ4, we re-tune the Z4 damping and gauge parameters to improve constraint control through inspiral, merger, and ringdown. For equal-mass, nonspinning binary black-hole simulations, the SSL+CAHD+CCZ4 scheme significantly reduces Hamiltonian and momentum-constraint violations in both the strong-field region and the wave-extraction zone.

Keywords: Numerical relativity; Classical black holes; Gravitational waves; Gravitational wave sources; CCZ4 formulation