The quasinormal-mode content of black hole ringdowns


Cheung, M. (2023). The quasinormal-mode content of black hole ringdowns. Perimeter Institute. https://pirsa.org/23100103


Cheung, Mark. The quasinormal-mode content of black hole ringdowns. Perimeter Institute, Oct. 19, 2023, https://pirsa.org/23100103


          @misc{ pirsa_PIRSA:23100103,
            doi = {10.48660/23100103},
            url = {https://pirsa.org/23100103},
            author = {Cheung, Mark},
            keywords = {Strong Gravity},
            language = {en},
            title = {The quasinormal-mode content of black hole ringdowns},
            publisher = {Perimeter Institute},
            year = {2023},
            month = {oct},
            note = {PIRSA:23100103 see, \url{https://pirsa.org}}

Mark Cheung Johns Hopkins University

Talk Type Scientific Series


In general relativity, the remnant black hole of a binary black hole merger emits “ringdown” radiation: a superposition of quasinormal modes with characteristic complex frequencies. The detection of more than one of these frequencies would serve as smoking-gun evidence of a black hole and would enable a test of the no-hair theorem. In this talk, I will discuss strategies for identifying quasinormal modes within simulated ringdown waveforms both in linear perturbation theory and full general relativity. I will show that a rich spectrum of modes could exist in the ringdown, including overtones, retrograde modes and nonlinear modes, and that interesting quasi-universal relationships exist between some of their amplitudes. I will also discuss the spectral instability of quasinormal modes and its potential imprints on the ringdown waveform. These results could guide the analysis of real ringdown signals detected by gravitational-wave detectors.


Zoom link https://pitp.zoom.us/j/92002625163?pwd=bHNDVVZKYnVNTENLNXJBLzVNKzVSQT09