Gauge Conditions for Long-Term Numerical Black Hole Evolution With or Without Excision

• Autores: Miguel Alcubierre, Bernd Brügmann, Denis Pollney, Edward Seidel, Ryoji Takahashi
• Localización: Current trends in relativistic astrophysics: theoretical, numerical, observational / coord. por Leonardo Fernández Jambrina, L.M. González-Romero, 2003, ISBN 3540019839, págs. 140-158
• Idioma: inglés
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• Resumen

  • We extend previous work on 3D black hole excision to the case of distorted black holes, with a variety of dynamic gauge conditions that are able to respond naturally to the spacetime dynamics. We show that the combination of excision and gauge conditions we use is able to drive highly distorted, rotating black holes to an almost static state at late times, with well behaved metric functions, without the need for any special initial conditions or analytically prescribed gauge functions. Further, we show for the first time that one can extract accurate waveforms from these simulations, with the full machinery of excision or no excision and dynamic gauge conditions. The evolutions can be carried out for long times, far exceeding the longevity and accuracy of even better resolved 2D codes. While traditional 2D codes show errors in quantities such as apparent horizon mass of over 100% by t ≈ 100M, and crash by t ≈ 150M, with our new techniques the same systems can be evolved for more than hundreds of M’s in full 3D with errors of only a few percent.