Bethe-Salpeter approach for relativistic positronium in a strong magnetic field

Details Bethe-Salpeter approach for relativistic positronium in a strong magnetic field Bethe-Salpeter approach for relativistic positronium in a strong magnetic field

2006-03-09

arxiv.org/abs/hep-th/0603070v2

Phys.Rev.D73:125021,2006

Physics

High Energy Physics

High Energy Physics - Theory

35 pages, minor corrections

Scientific paper

10.1103/PhysRevD.73.125021

We study the electron-positron system in a strong magnetic field using the differential Bethe-Salpeter equation in the ladder approximation. We derive the fully relativistic two-dimensional form that the four-dimensional Bethe-Salpeter equation takes in the limit of asymptotically strong constant and homogeneous magnetic field. An ultimate value for the magnetic field is determined, which provides the full compensation of the positronium rest mass by the binding energy in the maximum symmetry state and vanishing of the energy gap separating the electron-positron system from the vacuum. The compensation becomes possible owing to the falling to the center phenomenon that occurs in a strong magnetic field because of the dimensional reduction. The solution of the Bethe-Salpeter equation corresponding to the vanishing energy-momentum of the electron-positron system is obtained.

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