## Aspects of branes and orbifolds in string theory

##### Author(s)

Prezas, Nikolas, 1973-
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##### Other Contributors

Massachusetts Institute of Technology. Dept. of Physics.

##### Advisor

Amihay Hanany.

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Show full item record##### Abstract

The main theme of this thesis is branes and orbifolds in string theory, with some digression towards other directions in the final chapters. After reviewing background material on D-branes and orbifolds, along with some mathematical fundamentals, I describe the following results. First, a classification of discrete torsion for a large class of orbifolds and a technique for extracting the matter content of D-brane probe gauge theories on orbifolds with discrete torsion. Subsequently, I discuss an algorithm, called stepwise projection, that illuminates the structure of the so-called exceptional quivers, and hints towards the brane realization of the associated gauge theories. Next, I present the computation of the partition function of the coset conformal field theory describing the two-dimensional black hole. This computation confirms earlier results concerning the spectrum of the black hole and it enable us to identify the physical Hilbert space. This theory appears in the exact string theory description of configurations of Neveu-Schwarz 5-branes and in the conformal field theory description of certain orbifolds in singular limits; thus, it is only a mild digression from the main theme of the thesis. This is not so, however, for the last topic discussed here. We will change gears completely and discuss our extension of Witten's construction of boundary string field theory to the superstring. As in the bosonic case, the main tool we use is the Batalin-Vilkovisky formalism. Our construction proves a recent conjecture regarding the spacetime action of the supersymmetric theory and a related conjecture concerning quantum field theories on two-dimensional spaces with boundaries.

##### Description

Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 2002. Includes bibliographical references (p. 245-268).

##### Date issued

2002##### Department

Massachusetts Institute of Technology. Dept. of Physics.##### Publisher

Massachusetts Institute of Technology

##### Keywords

Physics.