Line data    Source code

       1           0 : // Distributed under the MIT License.
       2             : // See LICENSE.txt for details.
       3             : 
       4             : #pragma once
       5             : 
       6             : /*!
       7             :  * \brief The set of utilities for performing CurvedScalarWave evolution with a
       8             :  * worldtube excision scheme.
       9             :  *
      10             :  * \details The worldtube excision scheme is a method that aims to enable NR
      11             :  * evolutions of intermediate mass ratio binary black hole simulations. In
      12             :  * standard BBH simulations two excision spheres are cut out from the domain
      13             :  * within the apparent horizons of the respective black holes. For larger mass
      14             :  * ratios, this introduces a scale disparity in the evolution system because the
      15             :  * small grid spacing in the elements near the smaller black hole constrain the
      16             :  * time step to be orders of magnitude smaller than near the larger black hole
      17             :  * due to the CFL condition. The worldtube excision scheme avoids this by
      18             :  * excising a much larger region (the worldtube) around the smaller black hole.
      19             :  * Since the excision boundary no longer lies within the apparent horizon,
      20             :  * boundary conditions are required. These are derived by approximating the
      21             :  * solution inside the worldtube using a perturbative solution - a black hole
      22             :  * perturbed by another black hole. The solution is calibrated by the evolved
      23             :  * metric on the worldtube boundary and in turn provides boundary conditions to
      24             :  * the evolution system.
      25             :  *
      26             :  * Here, we test this scheme using a toy problem of a scalar charge in
      27             :  * circular orbit around a Schwarzschild black hole.
      28             :  */
      29             : namespace CurvedScalarWave::Worldtube {
      30             : }  // namespace CurvedScalarWave::Worldtube