2021-07-26

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*Title: On the excitation of black hole overtones [#w30f0384]

**Speaker: Naritaka Oshita [#d91b20a5]

Abstract: Understanding the nature of quasinormal ringing of black holes is important in the context of
gravitational wave (GW) astronomy, gauge/gravity correspondence, and even quantum gravity.
In this motivation, I will briefly review the essence of excitation factors of a ringing black hole.
The excitation factor quantifies the “ease-of-excitation” of the quasinormal modes of the black hole,
which may be an important ingredient to predict when the ringdown phase starts in GW signal
emitted by a binary black hole merger. I will also explain the recent progress, including my
preliminary result about the excitation factor of black hole overtones.