2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/170807We propose a general method to obtain the scalar worldline Green function on an arbitrary 1D topological space, with which the first-quantized method of evaluating 1-loop Feynman diagrams can be generalized to calculate arbitrary ones. The electric analog of the worldline Green function problem is found and a compact expression for the worldline Green function is given, which has similar structure to the 2D bosonic Green function of the closed bosonic string.20 pages, 6 figures; v2: typos corrected, references addedHigh Energy Physics - Theorytext