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Paper IPM / P / 8032  


Abstract:  
We construct the effective action of a DpbraneantiDpbrane system by making use of the nonabelian extension of tachyonic DBI action. We succeed the construction by restricting the ChanPaton factors of two nonBPS Dpbranes in the action to the ChanPaton factors of a Dp(D) over bar (p) system . For the special case that both branes are coincident, the action reduces to the one proposed by A. Sen.
The effective Dp(D) over bar (p) potential indicates that when branes separation is larger than the string length scale, there are two minima in the tachyon direction. As branes move toward each other under the gravitational force, the tachyon tunneling from false to true vacuum may make a bubble formation followed by a classical evolution of the bubble. On the other hand, when branes separation is smaller than the string length scale, the potential shows one maximum and one minimum. In this case, a homogeneous tachyon rolling in real time makes an attractive potential for the branes distance. This classical force is speculated to be the effective force between the two branes.
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