Breaking Pseudo-Rotational Symmetry through H₊² Metric Deformation in the Eckart Potential Problem
The peculiarity of the Eckart potential problem on H₊² (the upper sheet of the two-sheeted two-dimensional hyperboloid), to preserve the (2l+1)-fold degeneracy of the states typical for the geodesic motion there, is usually explained in casting the respective Hamiltonian in terms of the Casimir inva...
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| Опубліковано в: : | Symmetry, Integrability and Geometry: Methods and Applications |
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| Дата: | 2011 |
| Автори: | , , |
| Формат: | Стаття |
| Мова: | Англійська |
| Опубліковано: |
Інститут математики НАН України
2011
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| Онлайн доступ: | https://nasplib.isofts.kiev.ua/handle/123456789/148090 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Breaking Pseudo-Rotational Symmetry through H₊² Metric Deformation in the Eckart Potential Problem / N. Leija-Martinez, D.E. Alvarez-Castillo, M. Kirchbach // Symmetry, Integrability and Geometry: Methods and Applications. — 2011. — Т. 7. — Бібліогр.: 18 назв. — англ. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1862608499344670720 |
|---|---|
| author | Leija-Martinez, N. Alvarez-Castillo, D.E. Kirchbach, M. |
| author_facet | Leija-Martinez, N. Alvarez-Castillo, D.E. Kirchbach, M. |
| citation_txt | Breaking Pseudo-Rotational Symmetry through H₊² Metric Deformation in the Eckart Potential Problem / N. Leija-Martinez, D.E. Alvarez-Castillo, M. Kirchbach // Symmetry, Integrability and Geometry: Methods and Applications. — 2011. — Т. 7. — Бібліогр.: 18 назв. — англ. |
| collection | DSpace DC |
| container_title | Symmetry, Integrability and Geometry: Methods and Applications |
| description | The peculiarity of the Eckart potential problem on H₊² (the upper sheet of the two-sheeted two-dimensional hyperboloid), to preserve the (2l+1)-fold degeneracy of the states typical for the geodesic motion there, is usually explained in casting the respective Hamiltonian in terms of the Casimir invariant of an so(2,1) algebra, referred to as potential algebra. In general, there are many possible similarity transformations of the symmetry algebras of the free motions on curved surfaces towards potential algebras, which are not all necessarily unitary. In the literature, a transformation of the symmetry algebra of the geodesic motion on H₊² towards the potential algebra of Eckart's Hamiltonian has been constructed for the prime purpose to prove that the Eckart interaction belongs to the class of Natanzon potentials. We here take a different path and search for a transformation which connects the (2l+1) dimensional representation space of the pseudo-rotational so(2,1) algebra, spanned by the rank-l pseudo-spherical harmonics, to the representation space of equal dimension of the potential algebra and find a transformation of the scaling type. Our case is that in so doing one is producing a deformed isometry copy to H₊² such that the free motion on the copy is equivalent to a motion on H₊², perturbed by a coth interaction. In this way, we link the so(2,1) potential algebra concept of the Eckart Hamiltonian to a subtle type of pseudo-rotational symmetry breaking through H₊²metric deformation. From a technical point of view, the results reported here are obtained by virtue of certain nonlinear finite expansions of Jacobi polynomials into pseudo-spherical harmonics. In due places, the pseudo-rotational case is paralleled by its so(3) compact analogue, the cotangent perturbed motion on S2. We expect awareness of different so(2,1)/so(3) isometry copies to benefit simulation studies on curved manifolds of many-body systems.
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| first_indexed | 2025-11-28T17:34:14Z |
| format | Article |
| fulltext | |
| id | nasplib_isofts_kiev_ua-123456789-148090 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 1815-0659 |
| language | English |
| last_indexed | 2025-11-28T17:34:14Z |
| publishDate | 2011 |
| publisher | Інститут математики НАН України |
| record_format | dspace |
| spelling | Leija-Martinez, N. Alvarez-Castillo, D.E. Kirchbach, M. 2019-02-16T20:52:15Z 2019-02-16T20:52:15Z 2011 Breaking Pseudo-Rotational Symmetry through H₊² Metric Deformation in the Eckart Potential Problem / N. Leija-Martinez, D.E. Alvarez-Castillo, M. Kirchbach // Symmetry, Integrability and Geometry: Methods and Applications. — 2011. — Т. 7. — Бібліогр.: 18 назв. — англ. 1815-0659 2010 Mathematics Subject Classification: 47E05; 81R40 DOI: http://dx.doi.org/10.3842/SIGMA.2011.113 https://nasplib.isofts.kiev.ua/handle/123456789/148090 The peculiarity of the Eckart potential problem on H₊² (the upper sheet of the two-sheeted two-dimensional hyperboloid), to preserve the (2l+1)-fold degeneracy of the states typical for the geodesic motion there, is usually explained in casting the respective Hamiltonian in terms of the Casimir invariant of an so(2,1) algebra, referred to as potential algebra. In general, there are many possible similarity transformations of the symmetry algebras of the free motions on curved surfaces towards potential algebras, which are not all necessarily unitary. In the literature, a transformation of the symmetry algebra of the geodesic motion on H₊² towards the potential algebra of Eckart's Hamiltonian has been constructed for the prime purpose to prove that the Eckart interaction belongs to the class of Natanzon potentials. We here take a different path and search for a transformation which connects the (2l+1) dimensional representation space of the pseudo-rotational so(2,1) algebra, spanned by the rank-l pseudo-spherical harmonics, to the representation space of equal dimension of the potential algebra and find a transformation of the scaling type. Our case is that in so doing one is producing a deformed isometry copy to H₊² such that the free motion on the copy is equivalent to a motion on H₊², perturbed by a coth interaction. In this way, we link the so(2,1) potential algebra concept of the Eckart Hamiltonian to a subtle type of pseudo-rotational symmetry breaking through H₊²metric deformation. From a technical point of view, the results reported here are obtained by virtue of certain nonlinear finite expansions of Jacobi polynomials into pseudo-spherical harmonics. In due places, the pseudo-rotational case is paralleled by its so(3) compact analogue, the cotangent perturbed motion on S2. We expect awareness of different so(2,1)/so(3) isometry copies to benefit simulation studies on curved manifolds of many-body systems. We thank Jose Limon Castillo for constant assistance in managing computer matters. Work
 partly supported by CONACyT-M´exico under grant number CB-2006-01/61286. en Інститут математики НАН України Symmetry, Integrability and Geometry: Methods and Applications Breaking Pseudo-Rotational Symmetry through H₊² Metric Deformation in the Eckart Potential Problem Article published earlier |
| spellingShingle | Breaking Pseudo-Rotational Symmetry through H₊² Metric Deformation in the Eckart Potential Problem Leija-Martinez, N. Alvarez-Castillo, D.E. Kirchbach, M. |
| title | Breaking Pseudo-Rotational Symmetry through H₊² Metric Deformation in the Eckart Potential Problem |
| title_full | Breaking Pseudo-Rotational Symmetry through H₊² Metric Deformation in the Eckart Potential Problem |
| title_fullStr | Breaking Pseudo-Rotational Symmetry through H₊² Metric Deformation in the Eckart Potential Problem |
| title_full_unstemmed | Breaking Pseudo-Rotational Symmetry through H₊² Metric Deformation in the Eckart Potential Problem |
| title_short | Breaking Pseudo-Rotational Symmetry through H₊² Metric Deformation in the Eckart Potential Problem |
| title_sort | breaking pseudo-rotational symmetry through h₊² metric deformation in the eckart potential problem |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/148090 |
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