Off-Shell Interactions for Closed-String Tachyons.

Dabholkar, A. ; Iqubal, A. ; Raeymaekers, J.

Technical Information Center Oak Ridge Tennessee

关键词: Tachyons;    Orbifolds;    Matrix;    Decays;    String theory;   

RP-ID  :  DE2004826851

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

Off-shell interactions for localized closed-string tachyons in C/Z(sub 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.