ar X iv : h ep - t h / 98 01 10 3 v 2 2 4 A ug 1 99 8 Ward Identities in Non - equilibrium QED ∗
نویسنده
چکیده
We verify the QED Ward identity for the twoand three -point functions at non-equilibrium in the HTL limit. We use the Keldysh formalism of real time finite temperature field theory. We obtain an identity of the same form as the Ward identity for a set of one loop self-energy and one loop three-point vertex diagrams which are constructed from HTL effective propagators and vertices. Supported by BMBF, GSI Darmstadt, DFG and NSFC Heisenberg fellow 1
منابع مشابه
ar X iv : h ep - t h / 98 01 10 3 v 1 1 5 Ja n 19 98 Ward Identities in Non - equilibrium QED ∗
We verify the QED Ward identity for the twoand three -point functions at non-equilibrium in the HTL limit. We use the Keldysh formalism of real time finite temperature field theory. We obtain the same Ward identity for the one loop self-energy and the one loop three-point vertex when both diagrams are constructed from HTL effective propagators and vertices. Supported by BMBF, GSI Darmstadt, DFG...
متن کاملar X iv : h ep - t h / 98 09 02 0 v 1 2 S ep 1 99 8 On Gauge Invariance and Ward Identities for the Wilsonian
We investigate non-Abelian gauge theories within a Wilsonian Renormalisation Group approach. The cut-off term inherent in this approach leads to a modified Ward identity (mWI). It is shown that this mWI is compatible with the flow and that the full effective action satisfies the usual Ward identity (WI). The universal 1-loop β-function is derived within this approach and the extension to the 2-...
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