(m,n)-String-Like Dp-Brane Bound States

Abstract

An (m, n)-string bound state (with m, n relatively prime integers) in type IIB string theory can be interpreted from the D-string worldsheet point of view as n D-strings carrying m units of quantized electric flux or quantized electric field. We argue, from the D-brane worldvolume point of view, that similar Dp-brane bound states should also exist for $2\le p\le 8$ in both type IIA (when $p$ is even) and type IIB (when $p$ is odd) string theories. As in $p=1$ case, these bound states can each be interpreted as $n$ Dp-branes carrying m units of quantized constant electric field. In particular, they all preserve one half of the spacetime supersymmetries.

16 pages, Revtex, typos corrected and references added

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