Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1998-10-12
Int.J.Theor.Phys. 37 (1998) 1753-1771
Physics
High Energy Physics
High Energy Physics - Theory
21 page, LaTeX-file, to be published in Int. Jour. of Theor. Phys
Scientific paper
Convergence of the Schwinger --- DeWitt expansion for the evolution operator kernel for special class of potentials is studied. It is shown, that this expansion, which is in general case asymptotic, converges for the potentials considered (widely used, in particular, in one-dimensional many-body problems), and besides, convergence takes place only for definite discrete values of the coupling constant. For other values of the charge divergent expansion determines the kernels having essential singularity at origin (beyond usual $\delta$-function). If one consider only this class of potentials then one can avoid many problems, connected with asymptotic expansions, and one get the theory with discrete values of the coupling constant that is in correspondence with discreteness of the charge in the nature. This approach can be transmitted into the quantum field theory.
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