Feynman integral in regularized non-relativistic quantum electrodynamics

Details Feynman integral in regularized non-relativistic quantum electrodynamics Feynman integral in regularized non-relativistic quantum electrodynamics

1996-03-28

arxiv.org/abs/hep-ph/9603424v1

J.Math.Phys. 39 (1998) 1766-1787

Physics

High Energy Physics

High Energy Physics - Phenomenology

30 pages, LaTex file

Scientific paper

10.1063/1.532263

We express the unitary time evolution in non-relativistic regularized quantum electrodynamics at zero and positive temperature by a Feynman integral defined in terms of a complex Brownian motion. An average over the quantum electromagnetic field determines the form of the quantum mechanics in an environment of a quantum black body radiation. In this non-perturbative formulation of quantum electrodynamics we prove the existence of the classical limit $\hbar \rightarrow 0$.We estimate an error to some approximations commonly applied in quantum radiation theory.

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