String Amplitudes from Moyal String Field Theory
arXiv:hep-th/0211131 · doi:10.1103/PhysRevD.67.066002
Abstract
We illustrate a basic framework for analytic computations of Feynman graphs using the Moyal star formulation of string field theory. We present efficient methods of computation based on (a) the monoid algebra in noncommutative space and (b) the conventional Feynman rules in Fourier space. The methods apply equally well to perturbative string states or nonperturbative string states involving D-branes. The ghost sector is formulated using Moyal products with fermionic (b,c) ghosts. We also provide a short account on how the purely cubic theory and/or VSFT proposals may receive some clarification of their midpoint structures in our regularized framework.
19 pages, LaTeX, typos corrected, comments added, Eqs.(27-32)(55-59) added. Eq.(27) includes a more explicit result of the four point function
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- Is String Interaction the Origin of Quantum Mechanics?
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