World-line Green functions with momentum and source conservations
نویسنده
چکیده
Based on the generating functional method with an external source function, a useful constraint on the source function is proposed for analyzing the oneand two-loop world-line Green functions. The constraint plays the same role as the momentum conservation law of a certain nontrivial form, and transforms ambiguous Green functions into the uniquely defined Green functions. We also argue reparametrizations of the Green functions defined on differently parameterized world-line diagrams. PACS: 11.15.Bt; 11.10.Kk; 11.55.-m; 11.90.+t
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