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We consider tachyon condensation between a D-brane and an anti-D-brane insuperstring theory, when they are separated in their common transversedirections. A simple rolling tachyon solution, that describes the timeevolution of the process, is studied from the point of view of boundaryconformal field theory. By computing the boundary beta-functions of the system,one finds that this theory is conformal, hence corresponds to an exact solutionof the string theory equations of motion. By contrast, thetime-reversal-symmetric rolling tachyon is not conformal. These results putconstraints on the space-time effective actions for the system.

Rolling tachyons for separated brane-antibrane systems