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Boundary Conformal Field Theory and the Worldsheet Approach to D-Branes by Volker Schomerus, Andreas Recknagel

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Chapter 1 Free field theory with boundaries

Our aim in the first chapter is to explain the microscopic theory of strings and branes in flat backgrounds. The corresponding two-dimensional worldsheet theories can be solved with elementary methods. This will not only give us a chance to meet most of the relevant quantities from two-dimensional field theory but also to pass from worldsheet to target space concepts without much technical struggle.

Our exposition begins with an analysis of free bosonic fields on the half-plane. After a few comments on the classical action and possible boundary conditions we shall solve the model. The solution will enable us to calculate bulk operator products and correlation functions. Moreover, we shall take a ...

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