Hawking radiation and black-hole localization in the context of higher-dimensional gravitational theories (Doctoral thesis)

Παππάς, Θωμάς

In the first part of this thesis, we study the emission of Hawking radiation (HR) by higher-dimensional Schwarzschild-de Sitter (SdS) black holes in the context of the large extra dimensions scenario. Focusing on the emission of a scalar field, both on the brane and in the bulk, that is non-minimally coupled to gravity, we perform a thorough study of the corresponding greybody factors (GFs), i.e the transmission probability of the field in a given spacetime. The expressions for the GFs are derived both analytically and numerically by developing the appropriate numerical code. With our exact numerical results for the GFs, we then study in depth the HR spectra both in the brane and bulk channels of emission. Also, the effect of various definitions for the temperature of the SdS spacetime on the HR spectra is also investigated. The second part of this thesis is dedicated to the search for an exact analytic 5-dimensional black-hole solution, that is localized close to the brane in the context of the warped extra dimensions scenario. In the model we study, the line-element is of the Vaidya-type with a mass that depends on the radial, temporal and extra dimension coordinates. For the bulk content we consider various scalar field theories with one or multiple scalars, (non-)minimally coupled to gravity and with general kinetic and general potential terms.
Institution and School/Department of submitter: Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Φυσικής
Subject classification: Black holes
Keywords: Black holes,Extra dimensions,Hawking radiation,Μελανές οπές,Επιπλέον διαστάσεις,Ακτινοβολία Χόκινγκ
URI: http://olympias.lib.uoi.gr/jspui/handle/123456789/29350
Appears in Collections:Διδακτορικές Διατριβές

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