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SUMMARY:Centre colloquium: Ruth Gregory (King's College London)
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Title: Black Hole Spectroscopy from a Giant Quantum Vortex=0D=0A=
Abstract: Black-hole spectroscopy aims to infer physical properties of black holes by detecting the spectrum of quasi-normal modes (QNMs) they emit while settling towards equilibrium. Gravitational analogs aim to explore aspects of black hole systems by building laboratory experiments that share features of the black hole and its perturbations. A particularly interesting aspect of QNMs is the phenomenon of spectral instability: the complex frequencies of the modes wander as perturbations of the spacetime around the black hole are introduced. Having the ability to simulate in a controlled environment the behaviour of these modes is therefore appealing. I will describe the quantum vortex analog recently developed in the Nottingham Black Hole Laboratory and discuss the problem of how to identify the quasi-normal modes for such a confined system, as well as showing data from the experiment.=0D=0A=
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NOTE: the colloquium will be followed by an afternoon reception at 15:15 in the comon room on second floor of the Queens building. 
LOCATION:Graduate Centre 101
DTSTART:20260422T140000
DTEND:20260422T153000
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