Interactions of strings on a Tfold
Abstract
We consider the interactions of strings on Tfolds from the worldsheet point of view which are exact in α'. As a concrete example, we take a model where the internal torus at the SO(8) enhancement point is twisted by Tduality (Tfolded), and compute the scattering amplitudes of a class of massless strings. The fourpoint amplitudes involving both twisted and untwisted strings are obtained in a closed form in terms of the hyper geometric function. By their factorization, the threepoint coupling of the twisted and untwisted strings is found to be suppressed by the chiral momenta along the internal torus, and quantized in integer powers of 1/4. The asymptotic forms of the fourpoint amplitudes in highenergy limits are also obtained. Our results rely only on general properties of the asymmetric orbifold by the Tduality twist and of the Lie algebra lattice from the symmetry enhancement, and thus may be extended qualitatively to more general Tfolds.
 Publication:

Journal of High Energy Physics
 Pub Date:
 June 2022
 DOI:
 10.1007/JHEP06(2022)121
 arXiv:
 arXiv:2203.05841
 Bibcode:
 2022JHEP...06..121S
 Keywords:

 Conformal Field Models in String Theory;
 String Duality;
 Superstrings and Heterotic Strings;
 High Energy Physics  Theory
 EPrint:
 37 pages, 2 figures