Exactly Soluble Dynamics of (p,q) String Near Macroscopic Fundamental Strings

Details Exactly Soluble Dynamics of (p,q) String Near Macroscopic Fundamental Strings Exactly Soluble Dynamics of (p,q) String Near Macroscopic Fundamental Strings

2004-11-09

arxiv.org/abs/hep-th/0411099v1

JHEP0412:008,2004

Physics

High Energy Physics

High Energy Physics - Theory

27p, 2 figures

Scientific paper

10.1088/1126-6708/2004/12/008

We study dynamics of Type IIB bound-state of a Dirichlet string and n fundamental strings in the background of N fundamental strings. Because of supergravity potential, the bound-state string is pulled to the background fundamental strings, whose motion is described by open string rolling radion field. The string coupling can be made controllably weak and, in the limit $1 << g^2_{\rm st} n << g^2_{\rm st} N$, the bound-state energy involved is small compared to the string scale. We thus propose rolling dynamics of open string radion in this system as an exactly solvable analog for rolling dynamics of open string tachyon in decaying D-brane. The dynamics bears a novel feature that the worldsheet electric field increases monotonically to the critical value as the bound-state string falls into the background string. Close to the background string, D string constituent inside the bound-state string decouples from fundamental string constituents.

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