Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1999-05-12
Nucl.Phys. B580 (2000) 147-192
Physics
High Energy Physics
High Energy Physics - Theory
harvmac.tex, 55 pages, typos corrected, includes 2 figures. First part of section 3 expanded to give a clearer discussion of t
Scientific paper
10.1016/S0550-3213(00)00168-1
High energy fixed angle scattering is studied in matrix string theory. The saddle point world sheet configurations, which give the dominant contributions to the string theory amplitude, are taken as classical backgrounds in matrix string theory. A one loop fluctuation analysis about the classical background is performed. An exact treatment of the fermionic and bosonic zero modes is shown to lead to all of the expected structure of the scattering amplitude. The ten dimensional Lorentz invariant kinematical structure is obtained from the fermion zero modes, and the correct factor of the string coupling constant is obtained from the abelian gauge field zero modes. Up to a numerical factor we reproduce, from matrix string theory, the high energy limit of the tree level, four graviton scattering amplitude.
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