Exactly solvable Schrödinger operators related to the hypergeometric equation
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| Format: | Preprint |
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2025
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| _version_ | 1866910044443901952 |
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| author | Dereziński, Jan Karimi, Pedram |
| author_facet | Dereziński, Jan Karimi, Pedram |
| contents | We study one-dimensional Schrödinger operators defined as closed operators that are exactly solvable in terms of the Gauss hypergeometric function. We allow the potentials to be complex.
These operators fall into three groups. The first group can be reduced to the Gegenbauer equation, up to an affine transformation, a special case of the hypergeometric equation. The two other groups, which we call {\em hypergeometric of the first}, resp. {\em second kind}, can be reduced to the general Gauss hypergeometric equation. Each of the group is subdivided in three families, acting to on the Hilbert space $L^2]-1,1[,$ $L^2(\rr_+)$ resp. $L^2(\rr)$. Motivated by geometric applications of these families, we call them {\em spherical}, {\em hyperbolic}, resp. {\em deSitterian}. All these families are known from applications in Quantum Mechanics: e.g. spherical hypergeometric Schrödinger operators of the first kind are often called {\em trigonometric Pöschl-Teller Hamiltonians}.
For operators belonging to each family we compute their spectrum and determine their Green function (the integral kernel of their resolvent). We also describe transmutation identities that relate these Green functions. These identities interchange spectral parameters with coupling constants across different operator families. Finally, we describe how these operators arise from separation of variables of (pseudo-)Laplacians on symmetric manifolds.
Our paper can be viewed as a sequel to \cite{DL}, where closed realizations of one-dimensional Schrödinger operators solvable in terms Kummer's confluent equation were studied. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2509_03235 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Exactly solvable Schrödinger operators related to the hypergeometric equation Dereziński, Jan Karimi, Pedram Mathematical Physics Classical Analysis and ODEs Functional Analysis Spectral Theory 33C05, 34L40, 47A10, 81Q80 We study one-dimensional Schrödinger operators defined as closed operators that are exactly solvable in terms of the Gauss hypergeometric function. We allow the potentials to be complex. These operators fall into three groups. The first group can be reduced to the Gegenbauer equation, up to an affine transformation, a special case of the hypergeometric equation. The two other groups, which we call {\em hypergeometric of the first}, resp. {\em second kind}, can be reduced to the general Gauss hypergeometric equation. Each of the group is subdivided in three families, acting to on the Hilbert space $L^2]-1,1[,$ $L^2(\rr_+)$ resp. $L^2(\rr)$. Motivated by geometric applications of these families, we call them {\em spherical}, {\em hyperbolic}, resp. {\em deSitterian}. All these families are known from applications in Quantum Mechanics: e.g. spherical hypergeometric Schrödinger operators of the first kind are often called {\em trigonometric Pöschl-Teller Hamiltonians}. For operators belonging to each family we compute their spectrum and determine their Green function (the integral kernel of their resolvent). We also describe transmutation identities that relate these Green functions. These identities interchange spectral parameters with coupling constants across different operator families. Finally, we describe how these operators arise from separation of variables of (pseudo-)Laplacians on symmetric manifolds. Our paper can be viewed as a sequel to \cite{DL}, where closed realizations of one-dimensional Schrödinger operators solvable in terms Kummer's confluent equation were studied. |
| title | Exactly solvable Schrödinger operators related to the hypergeometric equation |
| topic | Mathematical Physics Classical Analysis and ODEs Functional Analysis Spectral Theory 33C05, 34L40, 47A10, 81Q80 |
| url | https://arxiv.org/abs/2509.03235 |