Graduate theses
Current Record: 27 of 195
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Title |
Quasinormal modes and AdS-CFT applications |
Alternative Title |
Ημικανονικοί τρόποι ταλάντωσης και AdS/CFT εφαρμογές |
Author
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Κέλλερ, Γεώργιος
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Thesis advisor
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Rosen, Christopher
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Abstract |
The AdS/CFT correspondence has been a remarkable tool in understanding stongly coupled quantum field theories through gravity. One of its most fascinating applications, are
considered to be quasinormal modes, which describe damped oscillations of a perturbed
gravitational background. Unlike normal modes, quasinormal modes are pure imaginary
and they provide us with vital information involving the decay of a field outside of a black
hole. In this thesis, we propose a definition of quasinormal modes in asymptotically AdS
spacetimes, with the boundary conditions imposed by the AdS/CFT dictionary. We then
proceed to compute the corresponding frequencies of a massless scalar field that perturbs a
five dimensional Schwarzschild AdS black hole and relate them to the poles of the retarded
Green’s function of the dual gauge theory at finite temperature. Furthermore, we investigate
the behavior of the retarded correlator for high and low frequencies and highlight that our
numerical results are verified in both regimes. In particular, we observe that in the low
frequency limit the viscosity over entropy ratio takes the universal value of 1/4π.
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Language |
English |
Issue date |
2023-11-22 |
Collection
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School/Department--School of Sciences and Engineering--Department of Physics--Graduate theses
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Type of Work--Graduate theses
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Permanent Link |
https://elocus.lib.uoc.gr//dlib/5/b/c/metadata-dlib-1698127505-229739-15880.tkl
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Views |
330 |