Local saturation of commutator matrix elements
1972
The aim of presenting a local approximation scheme in terms of intermediate states has been reached in part. The first order approximation can be carried out, the solution has the form of pole structures for the matrix elements of the retarded commutator. The second order approximation has been given for the vacuum one particle matrix element of the commutator. The problem of local approximations for matrix elements with more particles is under investigation.
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