Rolling tachyons for separated brane-antibrane systems

Details Rolling tachyons for separated brane-antibrane systems Rolling tachyons for separated brane-antibrane systems

2011-08-29

arxiv.org/abs/1108.5763v1

Physics

High Energy Physics

High Energy Physics - Theory

49 pages

Scientific paper

We consider tachyon condensation between a D-brane and an anti-D-brane in superstring theory, when they are separated in their common transverse directions. A simple rolling tachyon solution, that describes the time evolution of the process, is studied from the point of view of boundary conformal field theory. By computing the boundary beta-functions of the system, one finds that this theory is conformal, hence corresponds to an exact solution of the string theory equations of motion. By contrast, the time-reversal-symmetric rolling tachyon is not conformal. Using these results we study space-time effective actions that can describe the system in the vicinity of these exact solutions.

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