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Title Quasinormal modes and AdS-CFT applications
Alternative Title Ημικανονικοί τρόποι ταλάντωσης και AdS/CFT εφαρμογές
Author Κέλλερ, Γεώργιος
Thesis advisor Rosen, Christopher
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.
Language English
Issue date 2023-11-22
Collection   School/Department--School of Sciences and Engineering--Department of Physics--Graduate theses
  Type of Work--Graduate theses
Permanent Link https://elocus.lib.uoc.gr//dlib/5/b/c/metadata-dlib-1698127505-229739-15880.tkl Bookmark and Share
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