On Higher Derivative Terms in Tachyon Effective Actions

Details On Higher Derivative Terms in Tachyon Effective Actions On Higher Derivative Terms in Tachyon Effective Actions

2001-04-25

arxiv.org/abs/hep-th/0104218v2

JHEP 0106:060,2001

Physics

High Energy Physics

High Energy Physics - Theory

18 pages, Latex, 2 figures, references added and eqn (2.23) corrected

Scientific paper

10.1088/1126-6708/2001/06/060

We reconstruct the tachyon effective action for unstable D-branes in superstring theory by examining its behaviour near exactly marginal deformations, where the ambigous higher derivative terms can be eliminated. We then compare this action with that obtained in boundary string field theory and find remarkable agreement. In particular, the tension for lower dimensional branes and the BI-action for the centre of mass motion are reprodued exactly. We also comment on the action for tachyons on the kink in a D-brane/anti-D-brane system and on bosonic string theory.

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