Fock Vacuum Instability and Causality

Details Fock Vacuum Instability and Causality Fock Vacuum Instability and Causality

2001-04-02

arxiv.org/abs/hep-th/0104014v2

Physics

High Energy Physics

High Energy Physics - Theory

LaTeX, 8 pages

Scientific paper

The vacuum diagram is calculated at second order for theories with self-interacting massless fields in the framework of finite causal perturbation theory. It is pointed out that the infrared behaviour of the vacuum diagram leads to unstable Fock vacua for QCD or massless QED, but not for quantum gravity. Therefore a radical rearrangement of the physical system must take place for such theories. Conversely, stability of the Fock vacuum for massless interacting fields is another hint at the possibility that quantum gravity should be treated as an effective theory.

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