S-matrix elements and covariant tachyon action in type 0 theory
arXiv:hep-th/0309028 · doi:10.1016/j.nuclphysb.2004.10.055
Abstract
We evaluate the sphere level S-matrix element of two tachyons and two massless NS states, the S-matrix element of four tachyons, and the S-matrix element of two tachyons and two Ramon-Ramond vertex operators, in type 0 theory. We then find an expansion for theses amplitudes that their leading order terms correspond to a covariant tachyon action. To the order considered, there are no , $T^2(\prt T)^2$, , nor tachyon couplings, whereas, the tachyon couplings $F\bF T$ and are non-zero.
29 pages, latex, no figure
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