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Modified Coulomb potential of QED in a strong magnetic field

Presenter: Neda Sadooghi — Department of Physics, Sharif University of Technology, PO Box 11365-9161 Tehran-Iran

Neda Sadooghi

The static Coulomb potential of Quantum Electrodynamics (QED) is calculated in the presence of a strong magnetic field in the lowest Landau level (LLL) approximation using two different methods. First, the vacuum expectation value of the corresponding Wilson loop is calculated perturbatively in two different regimes of dynamical mass. The result is then compared with the static potential arising from a Born approximation. Both results coincide. Although the arising potentials show different behavior in the aforementioned regimes, a novel dependence on the angle between the particle-antiparticle's axis and the direction of the magnetic field is observed. A qualitative analysis of these potentials shows that in the a certain regime in the LLL for large enough magnetic field, bound states can be formed.