Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2004-03-24
JHEP 0405 (2004) 051
Physics
High Energy Physics
High Energy Physics - Theory
37 pages, 3 figures, LaTeX, JHEP class. Typos corrected, references added, published version
Scientific paper
10.1088/1126-6708/2004/05/051
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.
Dabholkar Atish
Iqubal Ashik
Raeymaekers Joris
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