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Proof of vanishing cohomology at the tachyon vacuum

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arxiv hep-th/0606142 v2 pith:L6S4I5E3 submitted 2006-06-15 hep-th

classification hep-th
keywords tachyonvacuumproofstateactedanalyticbosonicbrst
verification ladder T0 review T1 audit T2 compute T3 formal

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We prove Sen's third conjecture that there are no on-shell perturbative excitations of the tachyon vacuum in open bosonic string field theory. The proof relies on the existence of a special state A, which, when acted on by the BRST operator at the tachyon vacuum, gives the identity. While this state was found numerically in Feynman-Siegel gauge, here we give a simple analytic expression.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Deriving on-shell open string field amplitudes without using Feynman rules

    hep-th 2019-08 conditional novelty 7.0 of 10

    New gauge-invariant functionals of the open string field are shown to reproduce on-shell tree-level amplitudes around known D-brane backgrounds without using Feynman rules.

  2. Singular field redefinition between Witten's string field theory and Witten's theory deformed by Ellwood invariant

    hep-th 2026-01 conditional novelty 6.0 of 10

    A singular field redefinition connects Witten's open string field theory to its Ellwood-invariant deformation, and the tachyon vacuum transfers consistently.

  3. Numerical solution for tachyon vacuum in the Schnabl gauge

    hep-th 2019-08 conditional novelty 6.0 of 10

    A new level-truncation method reaches level 24 in the Schnabl gauge and shows the tachyon vacuum energy has a local minimum at level 12 before extrapolating toward the analytic value -1.

  4. On Analytical Solutions in Witten's Cubic Open String Field Theory

    hep-th 2024-12 accept novelty 3.0 of 10

    A lecture-note review of analytic tachyon vacuum solutions in open string field theory, including a one-parameter family of which the b = -1 member is non-physical.

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