Formulating the complete initial boundary value problem in numerical
relativity to model black hole echoes
Formulating the complete initial boundary value problem in numerical
relativity to model black hole echoes
In an attempt to simulate black hole echoes (generated by potential quantum-gravitational structure) in numerical relativity, we recently described how to implement a reflecting boundary outside of the horizon of a black hole in spherical symmetry. Here, we generalize this approach to spacetimes with no symmetries and implement it numerically …