Dec 15 – 16, 2022
Centre for Particle Theory, Durham
Europe/London timezone

Zero-damped Modes and Nearly Extremal Horizons

Dec 15, 2022, 5:20 PM
Ph8 (zoom room 1) (Centre for Particle Theory, Durham)

Ph8 (zoom room 1)

Centre for Particle Theory, Durham

Department of Physics Durham University South Road Durham DH1 3LE
Long talk (20 mins) Full Length Talks


Jason Joykutty (University of Cambridge)


Quasinormal modes are the gravitational wave analogue to the overtones heard after striking a bell. They dominate the signal observed during the ringdown phase after a dynamical event and are characterised by complex frequencies, which encode oscillation and exponential decay in time. As horizons become extremal, various computations (both analytic and numerical) have shown that in many cases, there exists a sequence of frequencies which become purely oscillatory in the limit and which cluster on a line in the complex plane. These are zero-damped modes and are conjectured to exist generically for nearly extremal horizons. In this talk, we shall discuss results that can be obtained toward resolving this question; for example, one can show that these modes do arise for the conformal Klein-Gordon equation on a class of spherically symmetric black hole spacetimes.

Type of presentation 20 minute talk
Would you be interested in receiving feedback on your presentation? Yes
Are you happy for your talk to be recorded? Yes
Please select the most relevant category Black holes

Primary author

Jason Joykutty (University of Cambridge)

Presentation materials