“School of Physic”
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| Paper IPM / Physic / 6584 |
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| Abstract: | |||||
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In this article we consider open strings with mixed boundary conditions (a
combination of Neumann and Dirichlet at each end), and discuss how their end
points show a Dp-brane with NS-NS charge, i.e. a bound state of a D-brane
with fundamental strings. We show these branes are BPS saturated. Restricting
ourselves to D-string case, their mass density is shown to be BPS saturated,
in agreement with SL(2,Z) invariance. Via Chan-Paton factors the consideration
is extended to the case of bound states of n D-strings and m F-strings.
These observations is checked both in string theory and the effective field theory
limit.
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