For three two-parameter nonlinear electrodynamics models, the paper finds parameter regions where stable Lorentz-violating magnetic vacua exist with bounded Hamiltonian and positive-semidefinite Hessian.
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Stable Magnetic Lorentz-Violating Vacua in Gauge-Invariant Nonlinear Electrodynamics
For three two-parameter nonlinear electrodynamics models, the paper finds parameter regions where stable Lorentz-violating magnetic vacua exist with bounded Hamiltonian and positive-semidefinite Hessian.