Computation of horizons and excision

Thursday, June 27, 2002 - 2:30pm - 3:00pm
Keller 3-180
Deirdre Shoemaker (The Pennsylvania State University)
One of the crucial aspects of numerically solving the Einstein equation for a space-time containing one or more black holes in a fully general relativistic manner, is handling the singularities intrinsic to the black holes. One of the most successful methods for handling the black-hole singularity in three-dimensional simulations is removing a region of the computational domain containing the singularity and interior to the black-hole horizon. This procedure is called excision and relies on knowledge of the black hole's horizon. I will discuss how the horizon of the black hole is located during numerical simulations and what the procedure is for excising the black-hole singularity in a code implementing finite differencing methods.