Dongsu Bak et al JHEP12(2004)008 doi:10.1088/1126-6708/2004/12/008
Dongsu Bak1, Soo-Jong Rey2 and Ho-Ung Yee3
Show affiliationsWe 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 << g2stn << g2stN, 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.
E-print Number: hep-th/0411099
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11.10.St Bound and unstable states; Bethe-Salpeter equations
Issue 12 (December 2004)
Received 11 November 2004, accepted for publication 3 December 2004
Published 3 January 2005
Dongsu Bak et al JHEP12(2004)008
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