The goal of the thesis is to investigate exact worldsheet descriptions of some black hole solutions in string theory and to analyse their properties. In particular, recently a worldsheet description has been found for a class of microstate solutions (describing some of the microstates of the black hole) in terms of nullgauged WessZuminoWitten (WZW) models. In such cases, the consistency of the worldsheet theory imposes the absence of horizons, as expected from a solution describing a particular microstate. The thesis will explore more general worldsheet models of this kind with the aim of understanding whether they can describe string dynamics on black hole solutions, and to study their properties. First, we will focus on a worldsheet description of Witten’s twodimensional black hole in both Euclidean and Lorentzian signatures, and we will show that such solutions can be obtained in the nullgauging formalism. This investigation is then extended to a more general class of models that describe nonextremal threecharge black holes. The spectrum of such models will be studied.
The goal of the thesis is to investigate exact worldsheet descriptions of some black hole solutions in string theory and to analyse their properties. In particular, recently a worldsheet description has been found for a class of microstate solutions (describing some of the microstates of the black hole) in terms of nullgauged WessZuminoWitten (WZW) models. In such cases, the consistency of the worldsheet theory imposes the absence of horizons, as expected from a solution describing a particular microstate. The thesis will explore more general worldsheet models of this kind with the aim of understanding whether they can describe string dynamics on black hole solutions, and to study their properties. First, we will focus on a worldsheet description of Witten’s twodimensional black hole in both Euclidean and Lorentzian signatures, and we will show that such solutions can be obtained in the nullgauging formalism. This investigation is then extended to a more general class of models that describe nonextremal threecharge black holes. The spectrum of such models will be studied.
Worldsheet description of black hole solutions in string theory
NOVELLI, LUCA
2023/2024
Abstract
The goal of the thesis is to investigate exact worldsheet descriptions of some black hole solutions in string theory and to analyse their properties. In particular, recently a worldsheet description has been found for a class of microstate solutions (describing some of the microstates of the black hole) in terms of nullgauged WessZuminoWitten (WZW) models. In such cases, the consistency of the worldsheet theory imposes the absence of horizons, as expected from a solution describing a particular microstate. The thesis will explore more general worldsheet models of this kind with the aim of understanding whether they can describe string dynamics on black hole solutions, and to study their properties. First, we will focus on a worldsheet description of Witten’s twodimensional black hole in both Euclidean and Lorentzian signatures, and we will show that such solutions can be obtained in the nullgauging formalism. This investigation is then extended to a more general class of models that describe nonextremal threecharge black holes. The spectrum of such models will be studied.File  Dimensione  Formato  

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https://hdl.handle.net/20.500.12608/70326