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On exact tachyon potential in open string field theory

Anton A. Gerasimov1 and Samson L. Shatashvili2

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In these notes we revisit the tachyon lagrangian in the open string field theory using background independent approach of Witten from 1992. We claim that the tree level lagrangian (up to second order in derivatives and modulo some class of field redefinitions) is given by L = eT(∂T)2+(1+T)eT. Upon obvious change of variables this leads to the potential energy −phi2log phi2/e with canonical kinetic term. This lagrangian may be also obtained from the effective tachyon lagrangian of the p-adic strings in the limit p→1. Applications to the problem of tachyon condensation are discussed.


Keywords

Superstring Vacua

D-branes

Bosonic Strings

Conformal Field Models in String Theory

PACS

11.25.Hf Conformal field theory, algebraic structures

14.80.-j Other particles (including hypothetical)

11.10.Ef Lagrangian and Hamiltonian approach

11.25.Uv D branes

Subjects

Particle physics and field theory

Dates

Issue 10 ( 1 October 2000)

Received 4 October 2000, accepted for publication 18 October 2000

Published 22 November 2000



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