Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1998-12-15
Published in Proceedings of the conference `Frontier Tests of QED and Physics of the Vacuum' Sandanski, Bulgaria, 9-15 June, 1
Physics
High Energy Physics
High Energy Physics - Theory
18 pages, LaTeX
Scientific paper
The short survey of computation and properties of effective Lagrange function of intensive field in two-loop approximation accounting for radiative interaction of virtual electrons is given. The renormalization of field, charge and mass is completely defined by the weak field behaviour of the exact Lagrange function: its real part must be Maxwellian and imaginary part must be quasiclassical $\propto \exp (-\pi m^2c^3/\hbar e\epsilon)$. For weak electric field radiative interaction manifests itself as electron mass shift. Using the renorminvariance at strong field and exponentiation at weak field it is possible to obtain information about contributions of high order in $\alpha$.
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