Evolution modes of the vacuum Wigner function in strong-field QED

Bialynicki-Birula I. ; Davis E.D. ; Rafelski J. (1993)


The physical content of a non-covariant quantum-field theoretic transport formalism for strong-field QED is addressed within an integral formulation of the evolution equations which highlights the relation to acoustic and Zitterbewegung modes of the field-free limit. Through the computation within this framework of the electric susceptibility of the vacuum at the one-loop level, it is established that the off-shell behaviour of the electron-positron field is correctly incorporated. The Zitterbewegung mode is seen to be solely responsible at the one-loop level for vacuum polarization. Implications for the full renormalisation of the theory are taken up.

Please refer to this item in SUNScholar by using the following persistent URL: http://hdl.handle.net/10019.1/12368
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