Conjecture on continuity of the Clifford linear gap function

Let A=(A1,,Ad)\bm{A}=(A_1,\ldots,A_d) be a tuple of Hermitian operators, let BB be a non-Hermitian matrix, and let (λ,ν)RdC(\bm{\lambda},\nu)\in\mathbb{R}^d\oplus\mathbb{C} be a probe site. The Clifford linear gap function is

μˉ(λ,ν)C(A,B)=minRe(Spec(L(λ,ν)(A,B))).\bar{\mu}_{(\bm{\lambda},\nu)}^{\mathrm{C}}(\bm{A},B)=\min\left\lvert\operatorname{Re}\left(\operatorname{Spec}\left(L_{(\bm{\lambda},\nu)}(\bm{A},B)\right)\right)\right\rvert.

Continuity conjecture. The Clifford linear gap function is pointwise continuous.

The conjecture concerns the stability of the real-part spectral gap of the non-Hermitian spectral localizer as the probe site and operator data vary. The source gives numerical evidence but no resolution, so the conjecture remains open.

Sources & referencesView supporting material

Primary source

Jose J. Garcia, “Clifford and quadratic composite operators with applications to non-Hermitian physics”, arXiv:2410.03880 (2025).

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