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Mixed Boundary Conditions and Brane-String Bound States

H. Arfaei, M. M. Sheikh-Jabbari

hep-tharXiv:hep-th/9709054

Abstract

In this article we consider open strings with mixed boundary conditions (a combination of Neumann and Dirichlet conditions at each end). We discuss how their end points show a Dp-brane with NS-NS charge, i.e. a bound state of a D-brane with a fundamental strings. We show that these branes are BPS saturated. In the case of one-branes, we show that their mass densities are in agreement with IIb SUGRA which is Sl(2,Z) invariant. Using Chan-Paton factors, we extend our results to the case of bound states of n D-strings and m F-strings. These string theoretic results are also checked in the effective field theory limit.

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