Fermion condensate and vacuum current density induced by homogeneous and inhomogeneous magnetic fields in (2+1) dimensions

The modeling of induced current density in eyes from static magnetic fields produce by MR scanner

Introduction: Staff and patient Movement in static magnetic field MRI scanner induces current density in the human tissues, so cause biologic effects in people. The aim of this study was the Modelling of current density induced by moving individual with different velocities in static magnetic field of magnetic resonance imaging. Materials and Methods: current ...

Vacuum functional and fermion condensate in the massive Schwinger model

We derive a systematic procedure of computing the vacuum functional and fermion condensate of the massive Schwinger model via a perturbative expansion in the fermion mass. We compute numerical results for the first nontrivial order. ∗)permanent address: Institut für theoretische Physik, Universität Wien Boltzmanngasse 5, 1090 Wien, Austria email address: [email protected]

Fermion Density Induced Instability of the W-boson Pair Condensate in Strong Magnetic Field

The electroweak vacuum structure in an external magnetic field close to the lower critical value is considered at finite fermion density. It is shown that the leading effect of the fermions is to reduce the symmetry of the W -pair condensate in the direction of the magnetic field. The energy is minimized by the appearance of a helicoidal structure of the condensate along the magnetic field. Thi...

Vacuum birefringence in strong inhomogeneous electromagnetic fields

QED in inhomogeneous magnetic fields.

A lower bound is placed on the fermionic determinant of Euclidean quantum electrodynamics in three dimensions in the presence of a smooth, finite–flux, static, unidirectional magnetic field B(r) = (0, 0, B(r)), where B(r) ≥ 0 or B(r) ≤ 0 and r is a point in the xy-plane. Bounds are also obtained for the induced spin for 2 + 1 dimensional QED in the presence of B(r). An upper bound is placed on ...