Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2004-04-27
Physics
High Energy Physics
High Energy Physics - Theory
22 pages, 2 figures, minor corrections and some errors removed
Scientific paper
The method of probe brane is the powerful one to obtain the effective action living on the probe brane from supergravity. We apply this method to the unstable brane systems, and understand the tachyon condensation in the context of the open/closed duality. First, we probe the parallel coincident branes by the anti-brane. In this case, the mass squared of the stretched string becomes negative infinite in the decoupling limit. So that the dual open string field theory is difficult to understand. Next, we probe parallel coincident branes by a brane intersecting with an angle. In this case, the stretched strings have the tachyonic modes localized near the intersecting point, and by taking the appropriate limit for the intersection angle, we can leave mass squared of this modes negative finite in the decoupling limit. Then we can obtain the information about the localized tachyon condensation from the probe brane action obtained using supergravity.
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