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