A phase correction that removes the reference-domain time advance turns the conventional scattering matrix into a Schur function, yielding projected and determinant causality sum rules that generalize known bounds to multichannel observables.
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Causality Sum Rules in Conventional Scattering Matrices
A phase correction that removes the reference-domain time advance turns the conventional scattering matrix into a Schur function, yielding projected and determinant causality sum rules that generalize known bounds to multichannel observables.