D-branes in Melvin Background

Abstract

In this paper we discuss D-branes in the Melvin background and its supersymmetric generalizations. In particular we determine the D-brane spectra in these backgrounds by constructing their boundary states explicitly, where some of the D-branes are supersymmetric. The results sensitively depend on whether the value of magnetic flux in the Melvin background is rational or irrational. For the rational case the D-branes are regarded as the generalizations of fractional D-branes in abelian orbifolds ${\mathbf{C}}^{\mathbf{n}}/{\mathbf{Z}}_{\mathbf{N}}$ of type II or type 0 string theory. For the irrational case we found a very limited spectrum. Since the background includes the nontrivial H-flux, the D-branes will provide interesting examples from the viewpoint of the noncommutative geometry.

Latex, 44 pages, 4 figures, v2: one figure added, position of figures moved, several points clarified, typos corrected and references added

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