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arXiv · 2601.10954

Exact Spectrum of a Curvature-Adapted $\mathbb{Z}_{2}^{3}$ Dunkl--Deng--Fan/Eckart System

Nikko John Leo S. Lobos
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Abstract

This study constructs and exactly solves a curvature-adapted radial Dunkl Hamiltonian for the coordinate-reflection group $\mathbb{Z}*{2}^{3}$ on 3D hyperbolic space, determining how curvature and Dunkl multiplicities govern the discrete spectrum and admissible radial states. The warped-product kinetic operator is defined by its Friedrichs extension, which selects the regular boundary condition in singular radial channels. The restriction $\alpha=2\kappa$ is an exact-solvability condition, not a general relation between molecular range and spatial curvature, and reduces the centrifugal and Deng--Fan terms exactly to a generalized Eckart problem. We derive the finite spectrum, Jacobi-polynomial radial eigenfunctions, normalization integrals, and normalizability condition $\eta*{n\ell}^{2}<q_{\kappa}/2$. Dunkl multiplicities affect the radial spectrum only through $\gamma=\mu_{1}+\mu_{2}+\mu_{3}$, whereas reflection eigenvalues restrict the angular degrees to $\ell=p+2k$, with total multiplicity $2\ell+1$. On each surviving branch, energy increases with $\ell$ and $\gamma$, while the number of bound states decreases. Quadratic-form Hellmann--Feynman identities give exact hyperbolic-interaction expectation values, and adjacent-level spacings follow directly from the spectrum. The undeformed and correlated flat limits recover the ordinary curvature-matched Eckart and Dunkl--Kratzer spectra, respectively. Finite-difference calculations for $\gamma=0$ and $1/2$ confirm the energies, continuum thresholds, and state counts. This tuned curvature-adapted construction is not the generic Euclidean Dunkl--Deng--Fan problem. It isolates the effects of negative curvature and reflection deformation on level ordering, binding thresholds, and bound-state counts, and provides analytic benchmarks for numerical and approximate treatments of singular curvature- and reflection-deformed radial Hamiltonians.

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Nikko John Leo S. Lobos. 2026-01-16. Exact Spectrum of a Curvature-Adapted $\mathbb{Z}_{2}^{3}$ Dunkl--Deng--Fan/Eckart System. https://doi.org/10.1088/1402-4896%2Fae9b49%2010.1088%2F1402-4896%2Fae9b49

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