# On the modeling of black hole ringdown

### APA

Oshita, N. (2022). On the modeling of black hole ringdown. Perimeter Institute. https://pirsa.org/22110054

### MLA

Oshita, Naritaka. On the modeling of black hole ringdown. Perimeter Institute, Nov. 10, 2022, https://pirsa.org/22110054

### BibTex

@misc{ pirsa_PIRSA:22110054, doi = {10.48660/22110054}, url = {https://pirsa.org/22110054}, author = {Oshita, Naritaka}, keywords = {Strong Gravity}, language = {en}, title = {On the modeling of black hole ringdown}, publisher = {Perimeter Institute}, year = {2022}, month = {nov}, note = {PIRSA:22110054 see, \url{https://pirsa.org}} }

Naritaka Oshita Kyoto University

## Abstract

A gravitational wave from a binary black hole merger is an important probe to test gravity. Especially, the observation of ringdown may allow us to perform a robust test of gravity as it is a superposition of excited quasi-normal (QN) modes of a Kerr black hole. The excitation factor is an important quantity that quantifies the excitability of QN modes and is independent of the initial data of the black hole.

In this talk, I will show which QN modes can be important (i.e., have higher excitation factors) and will discuss how we can determine the start time of ringdown to maximally enhance the detectability of the QN modes.

Also, I will introduce my recent conjecture on the modeling of ringdown waveform:

the thermal ringdown model in which the ringdown of a small mass ratio merger involving a spinning black hole can be modeled by the Fermi-Dirac distribution.

Zoom link: https://pitp.zoom.us/j/96739417230?pwd=Tm00eHhxNzRaOEQvaGNzTE85Z1ZJdz09