Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1998-11-27
Nucl.Phys. B545 (1999) 233-282
Physics
High Energy Physics
High Energy Physics - Theory
62 pages, LaTeX, 3 ps-figures. References added, some typos corrected, final version to appear in Nucl. Phys. B
Scientific paper
10.1016/S0550-3213(99)00060-7
Boundary conformal field theory is the suitable framework for a microscopic treatment of D-branes in arbitrary CFT backgrounds. In this work, we develop boundary deformation theory in order to study the changes of boundary conditions generated by marginal boundary fields. The deformation parameters may be regarded as continuous moduli of D-branes. We identify a large class of boundary fields which are shown to be truly marginal, and we derive closed formulas describing the associated deformations to all orders in perturbation theory. This allows us to study the global topology properties of the moduli space rather than local aspects only. As an example, we analyse in detail the moduli space of c=1 theories, which displays various stringy phenomena.
Recknagel Andreas
Schomerus Volker
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