Ym. Chen et A. Korpel, EIKONAL VERSION OF THE FEYNMAN DIAGRAM APPROACH TO ACOUSTOOPTICS .1. CYLINDRICAL SOUND-WAVE-FRONTS, Journal of the Optical Society of America. A, Optics, image science,and vision., 12(3), 1995, pp. 541-547
By application of eikonal methods to Feynman diagrams the existence of
local independent interaction points is rigorously proved, and closed
-form expressions are derived for scattering into any order. The resul
ts are in good agreement with numerical simulations.