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gr-qc2003
Maxwell's field coupled nonminimally to quadratic torsion: Induced axion field and birefringence of the vacuum
Yakov Itin, Friedrich W. Hehl
We consider a possible (parity conserving) interaction between the electromagnetic field and a torsion field of spacetime. For generic elementary torsion, gauge invariant…
math-ph2003
Noether currents and charges for Maxwell-like Lagrangians
Yakov Itin
Hilbert-Noether theorem states that a current associated to diffeomorphism invariance of a Lagrangian vanishes on shell modulo a divergence of an arbitrary superpotential. Applicat…