The first Gribov horizon of a transverse gauge background equals the first appearance of −1 in the spectrum of a normalized Birman-Schwinger operator, via an inertia-preserving congruence rather than a similarity.
Estimates for the number of negative eigenvalues of the Schrödinger operator and its generalizations,
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Birman-Schwinger Formulation of the Faddeev-Popov Zero-Mode Problem
The first Gribov horizon of a transverse gauge background equals the first appearance of −1 in the spectrum of a normalized Birman-Schwinger operator, via an inertia-preserving congruence rather than a similarity.