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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 2 Superstrings and branes

Our main goal in the opening chapters is twofold: namely, to introduce some very basic concepts of boundary conformal field theory (CFT); and to link them to developments in string theory. We have now dispensed with the first task, as far as is possible without the more advanced technology we will provide in Chapters 3 and 4.

Here, we will link the main concepts of the previous chapter, such as boundary conditions, boundary states and boundary excitations, to target space concepts in string theory. Before that, we will sketch some of the very basics of string theory, mostly dating back to the 1970s and 1980s. Obviously, our exposition cannot serve as a textbook introduction to string theory, but we hope that ...

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