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Journal Article

Spontaneous particle creation in time-dependent overcritical fields

MPS-Authors

Szpak,  Nikodem
Geometric Analysis and Gravitation, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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JPhysA8_16_164059.pdf
(Publisher version), 240KB

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Citation

Szpak, N. (2008). Spontaneous particle creation in time-dependent overcritical fields. Journal of Physics A, 41(16): 164059. doi:10.1088/1751-8113/41/16/164059.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0013-6245-3
Abstract
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.