Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1997-09-08
Nucl.Phys.B526:278-294,1998
Physics
High Energy Physics
High Energy Physics - Theory
Latex file, 20 pages, No Figures, some paragraphs added
Scientific paper
10.1016/S0550-3213(98)00360-5
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 $D_p$-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.
Arfaei H.
Sheikh-Jabbari Mohammad M.
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