In derived-type higher-derivative theories, Noether's theorem produces an n-parameter family of conserved second-rank tensors from each isometry, with stability when the wave operator polynomial has simple real roots.
Canonical formalism and quantization of perturbative sector of higher-derivative theories
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Conservation Laws and Stability of Field Theories of Derived Type
In derived-type higher-derivative theories, Noether's theorem produces an n-parameter family of conserved second-rank tensors from each isometry, with stability when the wave operator polynomial has simple real roots.