String Interactions from Matrix String Theory

Abstract

The Matrix String Theory, i.e. the two dimensional U(N) SYM with N=(8,8) supersymmetry, has classical BPS solutions that interpolate between an initial and a final string configuration via a bordered Riemann surface. The Matrix String Theory amplitudes around such a classical BPS background, in the strong Yang--Mills coupling, are therefore candidates to be interpreted in a stringy way as the transition amplitude between given initial and final string configurations. In this paper we calculate these amplitudes and show that the leading contribution is proportional to the factor g_s^{-χ}, where χis the Euler characteristic of the interpolating Riemann surface and g_s is the string coupling. This is the factor one expects from perturbative string interaction theory.

15 pages, 2 eps figures, JHEP Latex class, misprints corrected

References in corpus (3)

• Gauge fields and interactions in matrix string theory
• Matrix String Theory, 2D SYM Instantons and affine Toda systems
• Bound States of Type I D-Strings

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