Schwinger pair production in space and time-dependent electric fields: Relating the Wigner formalism to quantum kinetic theory

Jul, 2010
17 pages
Published in:
  • Phys.Rev.D 82 (2010) 105026
e-Print:

Citations per year

2010201420182022202505101520
Abstract: (arXiv)
The non-perturbative electron-positron pair production (Schwinger effect) is considered for space- and time-dependent electric fields E(x,t)\vec{E}(\vec{x},t). Based on the Dirac-Heisenberg-Wigner (DHW), formalism we derive a system of partial differential equations of infinite order for the sixteen irreducible components of the Wigner function. In the limit of spatially homogeneous fields the Vlasov equation of quantum kinetic theory (QKT) is rediscovered. It is shown that the quantum kinetic formalism can be exactly solved in the case of a constant electric field E(t)=E0E(t)=E_0 and the Sauter-type electric field E(t)=E0sech2(t/τ)E(t)=E_0\operatorname{sech}^2(t/\tau). These analytic solutions translate into corresponding expressions within the DHW formalism and allow to discuss the effect of higher derivatives. We observe that spatial field variations typically exert a strong influence on the components of the Wigner function for large momenta or for late times.
  • 11.15.Tk
  • 12.20.Ds
  • electric field: space-time dependence
  • expansion: derivative
  • electron: pair production
  • differential equations
  • nonperturbative
  • Vlasov equation
  • phase space
  • higher-order: 0