The Rolling Tachyon Boundary Conformal Field Theory on an Orbifold

Details The Rolling Tachyon Boundary Conformal Field Theory on an Orbifold The Rolling Tachyon Boundary Conformal Field Theory on an Orbifold

2006-02-08

arxiv.org/abs/hep-th/0602081v1

Phys.Rev.D73:106003,2006

Physics

High Energy Physics

High Energy Physics - Theory

23 pages

Scientific paper

10.1103/PhysRevD.73.106003

We consider the non-trivial boundary conformal field theory with exactly marginal boundary deformation. In recent years this deformation has been studied in the context of rolling tachyons and S-branes in string theory. Here we study the problem directly from an open string point of view, at one loop. We formulate the theory of the Z_2 reflection orbifold. To do so, we extend fermionization techniques originally introduced by Polchinski and Thorlacius. We also explain how to perform the open string computations at arbitrary (rational) radius, by consistently constructing the corresponding shift orbifold, and show in what sense these are related to known boundary states. In a companion paper, we use these results in a cosmological context involving decaying branes.

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