New generic ringdown frequencies at the birth of a Kerr black hole

Aaron Zimmerman, Yanbei Chen
2011 Physical Review D  
We discuss a new ringdown frequency mode for vacuum perturbations of the Kerr black hole. We evolve initial data for the vacuum radial Teukolsky equation using a near horizon approximation, and find a frequency mode analogous to that found in a recent study of radiation generated by a plunging particle close to the Kerr horizon. We discuss our results in the context of that study. We also explore the utility of this mode by fitting a numerical waveform with a combination of the usual
more » ... he usual quasi-normal modes (QNMs) and the new oscillation frequency.
doi:10.1103/physrevd.84.084012 fatcat:saowqgez7vbj7oxz2so5ybsm6u