On particle production by classical backgrounds

Details On particle production by classical backgrounds On particle production by classical backgrounds

2001-03-29

arxiv.org/abs/hep-th/0103251v2

Physics

High Energy Physics

High Energy Physics - Theory

9 pages, 2 figures included, a misprint corrected: J_{\int} -> J_{int}

Scientific paper

The theory of quantum fields in classical backgrounds is re-examined for the cases in which the Lagrangian is quadratic in quantum fields. Various methods that describe particle production are discussed. It is found that all methods suffer from certain ambiguities, related to the choice of coordinates, gauge, or counter-terms. They also seem to be inconsistent with the conservation of energy. This suggests that such classical backgrounds may not cause particle production.

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