摘要: The Fermi interaction (anti psi ysub(n) psi)sup(2) is investigated with the method of field. The analogues of the Ward-Takahashi electrodynamical identities and the gauge transformations of Green functions, that are the consequenc... 展开 The Fermi interaction (anti psi ysub(n) psi)sup(2) is investigated with the method of field. The analogues of the Ward-Takahashi electrodynamical identities and the gauge transformations of Green functions, that are the consequence of the conservation of vector current, have been obtained. The gauge function for the spinor propagator is the exponential superpropagator. The arguments are given in favour of the existence of a modified perturbation theory, which is finite in every order and non-analytical over its coupling constant, for the four-fermion interaction. The non-analytical part is defined unambiguously, and the analytical part contains a set of finite dimensionless constants to define which non-perturbative information is needed. The simplest model (the chain approximation) for the non-stable vector bound state is considered. (Atomindex citation 15:039504) 收起