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Path integral formalism for the free Dirac propagator in spherical coordinates (2309.13688v1)
Published 24 Sep 2023 in physics.atom-ph and quant-ph
Abstract: The relativistic Green's function of a free spin-1/2 fermion is derived using the Feynman path integral formalism in spherical coordinates. The Green's function is reduced to an exactly solvable path integral by an appropriate coordinate transformation. The result is given in terms of spherical Bessel functions and spherical spinors, and agrees with previous solutions of the problem.