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Title: Hydrodynamic simulations of rotating black holes
Author: Torres Vicente, Theo
Awarding Body: University of Nottingham
Current Institution: University of Nottingham
Date of Award: 2019
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Wave scattering phenomena are ubiquitous in almost all Sciences, from Biology to Physics. Interestingly, it has been shown many times that different physical systems are the stage to the same processes. The discoveries of such analogies have resulted in a better understanding of Physics and are indications of the universality of Nature. One stunning example is the observation that waves propagating on a flowing fluid effectively experience the presence of a curved space-time. In this thesis we will use this analogy to investigate, both theoretically and experimentally, fundamental effects occurring around vortex flows and rotating black holes. In particular, we will focus on light-bending, superradiance scattering, and quasi-normal modes emission. The experimental nature of this work will lead us to study these processes in the presence of dispersive effects. After a general and historical discussion of the field of analogue gravity, we will first present a well-established technique, the gradient expansion method, to obtain approximate solutions of dynamical equations. This method will be used to generalise the notion of light-rings around black holes to vortex flows. Secondly, we will present a wave-vortex scattering experiment in which the superradiance process was observed. Finally, we will relate the properties of the light-rings to the characteristic modes emitted during the relaxation phase of a perturbed vortex flow. We will show that these characteristic modes can be used to develop a flow measurement technique that we call ‘Analogue Black Hole Spectroscopy’. We will then report on an experiment in which these characteristic modes were observed and the analogue black hole spectroscopy technique was applied successfully. Our results strengthen the link between vortices and rotating black holes and open up new challenges to be addressed in the future.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: QB Astronomy