Super-Poincare Invariant Koba-Nielsen Formulas for the Superstring
Nathan Berkovits
TL;DR
This paper introduces a super-Poincare invariant Koba-Nielsen formula for superstring scattering amplitudes, enabling calculations of tree-level processes for massless states in four dimensions, including D-brane interactions.
Contribution
It presents a new spacetime-supersymmetric formulation of the superstring that yields a manifestly invariant Koba-Nielsen amplitude expression.
Findings
Derived a super-Poincare invariant Koba-Nielsen formula for superstring amplitudes.
Extended the formula to include scattering in D-brane backgrounds.
Validated the approach with explicit tree-level amplitude calculations.
Abstract
The new spacetime-supersymmetric description of the superstring is used to compute tree-level scattering amplitudes for an arbitrary number of massless four-dimensional states. The resulting Koba-Nielsen formula is manifestly SO(3,1) super-Poincare invariant and is easily generalized to scattering in the presence of a D-brane.
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