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Article Dans Une Revue Communications in Mathematical Physics Année : 2005

Existence of a stable polarized vacuum in the Bogoliubov-Dirac-Fock approximation

Résumé

According to Diracrsquos ideas, the vacuum consists of infinitely many virtual electrons which completely fill up the negative part of the spectrum of the free Dirac operator D0. In the presence of an external field, these virtual particles react and the vacuum becomes polarized. In this paper, following Chaix and Iracane (J. Phys. B 22, 3791-3814 (1989)), we consider the Bogoliubov-Dirac-Fock model, which is derived from no-photon QED. The corresponding BDF-energy takes the polarization of the vacuum into account and is bounded from below. A BDF-stable vacuum is defined to be a minimizer of this energy. If it exists, such a minimizer is the solution of a self-consistent equation. We show the existence of a unique minimizer of the BDF-energy in the presence of an external electrostatic field, by means of a fixed-point approach. This minimizer is interpreted as the polarized vacuum.
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Dates et versions

hal-00093533 , version 1 (13-09-2006)

Identifiants

  • HAL Id : hal-00093533 , version 1

Citer

Christian Hainzl, Mathieu Lewin, Eric Séré. Existence of a stable polarized vacuum in the Bogoliubov-Dirac-Fock approximation. Communications in Mathematical Physics, 2005, 257, pp.515--562. ⟨hal-00093533⟩
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