Aspects of multimode Kerr ring-down fitting

Understand

A black hole that is ringing down to quiescence emits gravitational radiation of a very specific nature that can inform us of its mass and angular momentum, test the no-hair theorem for black holes, and perhaps even give us additional information about its progenitor system.

• This paper provides a detailed description of, and investigation into the behavior of, multimode fitting of the ring-down signal provided by numerical simulations.
• We find that there are at least three well-motivated multimode fitting schemes that can be used.
• These methods are tested against a specific numerical simulation to allow for comparison to prior work.