Spontaneous particle creation in time-dependent overcritical fields

Details Spontaneous particle creation in time-dependent overcritical fields Spontaneous particle creation in time-dependent overcritical fields

2006-04-13

arxiv.org/abs/hep-th/0604101v1

J.Phys.A41:164059,2008

Physics

High Energy Physics

High Energy Physics - Theory

4 pages, 6 figures, summary of the PhD thesis of the author

Scientific paper

10.1088/1751-8113/41/16/164059

It is believed that in presence of some strong electromagnetic fields, called overcritical, the (Dirac) vacuum becomes unstable and decays leading to a spontaneous production of an electron-positron pair. Yet, the arguments are based mainly on the analysis of static fields and are insufficient to explain this phenomenon completely. Therefore, we consider time-dependent overcritical fields and show, within the external field formulation, how spontaneous particle creation can be defined and measured in physical processes. We prove that the effect exists always when a strongly overcritical field is switched on, but it becomes unstable and hence generically only approximate and non-unique when the field is switched on and off. In the latter case, it becomes unique and stable only in the adiabatic limit.

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