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Transverse Ward-Takahashi Identity, Anomaly and Schwinger-Dyson Equation | | Kei-Ichi Kondo
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15 Aug 1996 | | Journal: | Int.J.Mod.Phys. A12 (1997) 5651-5686 | | Abstract: | Based on the path integral formalism, we rederive and extend the transverse Ward-Takahashi identities (which were first derived by Yasushi Takahashi) for the vector and the axial vector currents and simultaneously discuss the possible anomaly for them. Subsequently, we propose a new scheme for writing down and solving the Schwinger-Dyson equation in which the the transverse Ward-Takahashi identity together with the usual (longitudinal) Ward-Takahashi identity are applied to specify the fermion-boson vertex function. Especially, in two dimensional Abelian gauge theory, we show that this scheme leads to the exact and closed Schwinger-Dyson equation for the fermion propagator in the chiral limit (when the bare fermion mass is zero) and that the Schwinger-Dyson equation can be exactly solved. | | Source: | arXiv, hep-th/9608100 | | Services: | Forum | Review | PDF | Favorites | |
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