Tachyon potential in KBc subalgebra

Details Tachyon potential in KBc subalgebra Tachyon potential in KBc subalgebra

2010-04-25

arxiv.org/abs/1004.4351v2

Prog.Theor.Phys.124:567-580,2011; Prog.Theor.Phys.124:567-580,2010

Physics

High Energy Physics

High Energy Physics - Theory

14 pages, 3 figures, references added

Scientific paper

10.1143/PTP.124.567

We evaluate the classical action and the effective tachyon potential of open string field theory within KBc subalgebra, which is extensively used in analytic solution for tachyon condensation recently found by Erler and Schnabl. It is found that the level expansion of the string field terminates at level 3. We find that the closed string vacuum is a saddle point of the classical action. We also evaluate the effective potential for tachyon field. The closed string vaccum becomes stable by integrationg out an auxiliary field. It is found that the effective potential is bounded below hence has no runaway direction. We also argue validity of simple identity based solution.

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