Off-Shell Interactions for Closed-String Tachyons

Abstract

Off-shell interactions for localized closed-string tachyons in C/Z_N superstring backgrounds are analyzed and a conjecture for the effective height of the tachyon potential is elaborated. At large N, some of the relevant tachyons are nearly massless and their interactions can be deduced from the S-matrix. The cubic interactions between these tachyons and the massless fields are computed in a closed form using orbifold CFT techniques. The cubic interaction between nearly-massless tachyons with different charges is shown to vanish and thus condensation of one tachyon does not source the others. It is shown that to leading order in N, the quartic contact interaction vanishes and the massless exchanges completely account for the four point scattering amplitude. This indicates that it is necessary to go beyond quartic interactions or to include other fields to test the conjecture for the height of the tachyon potential.

37 pages, 3 figures, LaTeX, JHEP class. Typos corrected, references added, published version

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• WZW-like Action for Heterotic String Field Theory
• Twisted Tachyon Condensation in Closed String Field Theory
• Heterotic String Field Theory
• The Coulomb Branch in Gauged Linear Sigma Models
• On tachyons, gauged linear sigma models, and flip transitions
• On the time-dependent description for the decay of unstable D-branes
• Interactions for Winding Strings in Misner Space
• Toda systems in closed string tachyon condensation