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math-ph2026
Metric completion of the Bender--Brody--Müller Hamiltonian: dilation spectrum and missing eigenstates
Kejun Liu
The Bender--Brody--Müller (BBM) Hamiltonian was proposed as a non-Hermitian Hilbert--Pólya operator. We analyze the Hilbert completion induced, on the standard half-line core…
math-ph2026
Exceptional Points as Manifestations of Analyticity Breakdown in the 't Hooft Model
Kejun Liu
We use the exactly-solvable t Hooft model of 1+1D large-N_c QCD as a rigorous laboratory for the breakdown of analyticity of a causal response function, the meson two-point functio…