Toward Open-Closed String Theoretical Description of Rolling Tachyon

Physics – High Energy Physics – High Energy Physics - Theory

Scientific paper

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1+10 pages, 6 figures. v2: a reference added

Scientific paper

10.1103/PhysRevD.69.026008

We consider how the time-dependent decay process of an unstable D-brane should be described in the full (quantum) open-closed string theory. It is argued that the system, starting from the unstable D-brane configuration, will evolve in time into the time-independent open string tachyon vacuum configuration which we assume to be finite, with the total energy conserved. As a concrete realization of this idea, we construct a toy model describing the open and closed string tachyons which admits such a time-dependent solution. The structure of our model has some resemblance to that of open-closed string field theory.

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