Different Hamiltonians for differential Painlevé equations and their identification using a geometric approach
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
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2021
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| _version_ | 1866913456497623040 |
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| author | Dzhamay, Anton Filipuk, Galina Ligȩza, Adam Stokes, Alexander |
| author_facet | Dzhamay, Anton Filipuk, Galina Ligȩza, Adam Stokes, Alexander |
| contents | It is well-known that differential Painlevé equations can be written in a Hamiltonian form. However, a coordinate form of such representation is far from unique -- there are many very different Hamiltonians that result in the same differential Painlevé equation. Recognizing a Painlevé equation, for example when it appears in some applied problem, is known as the \emph{Painlevé equivalence problem}, and the question that we consider here is the Hamiltonian form of this problem. Making such identification explicit, on the level of coordinate transformations, can be very helpful for an applied problem, since it gives access to the wealth of known results about Painlevé equations, such as the structure of the symmetry group, special solutions for special values of the parameters, and so on. It can also provide an explicit link between different problems that have the same underlying structure. In this paper we describe a systematic procedure for finding changes of coordinates that trasform different Hamiltonian representations of a Painlevé equation into some chosen canonical form. Our approach is based on Sakai's geometric theory of Painlevé equations. We explain this procedure in detail for the fourth differential ${\text{P}_{\mathrm{IV}}}$ equation, and also give a brief summary of some known examples for ${\text{P}_{\mathrm{V}}}$ and ${\text{P}_{\mathrm{VI}}}$ cases. It is clear that this approach can easily be adapted to other examples as well, so we expect our paper to be a useful reference for some of the realizations of Okamoto spaces of initial conditions for Painlevé equations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2109_06428 |
| institution | arXiv |
| publishDate | 2021 |
| record_format | arxiv |
| spellingShingle | Different Hamiltonians for differential Painlevé equations and their identification using a geometric approach Dzhamay, Anton Filipuk, Galina Ligȩza, Adam Stokes, Alexander Exactly Solvable and Integrable Systems Mathematical Physics 33D45, 34M55, 34M56, 14E07, 39A13 It is well-known that differential Painlevé equations can be written in a Hamiltonian form. However, a coordinate form of such representation is far from unique -- there are many very different Hamiltonians that result in the same differential Painlevé equation. Recognizing a Painlevé equation, for example when it appears in some applied problem, is known as the \emph{Painlevé equivalence problem}, and the question that we consider here is the Hamiltonian form of this problem. Making such identification explicit, on the level of coordinate transformations, can be very helpful for an applied problem, since it gives access to the wealth of known results about Painlevé equations, such as the structure of the symmetry group, special solutions for special values of the parameters, and so on. It can also provide an explicit link between different problems that have the same underlying structure. In this paper we describe a systematic procedure for finding changes of coordinates that trasform different Hamiltonian representations of a Painlevé equation into some chosen canonical form. Our approach is based on Sakai's geometric theory of Painlevé equations. We explain this procedure in detail for the fourth differential ${\text{P}_{\mathrm{IV}}}$ equation, and also give a brief summary of some known examples for ${\text{P}_{\mathrm{V}}}$ and ${\text{P}_{\mathrm{VI}}}$ cases. It is clear that this approach can easily be adapted to other examples as well, so we expect our paper to be a useful reference for some of the realizations of Okamoto spaces of initial conditions for Painlevé equations. |
| title | Different Hamiltonians for differential Painlevé equations and their identification using a geometric approach |
| topic | Exactly Solvable and Integrable Systems Mathematical Physics 33D45, 34M55, 34M56, 14E07, 39A13 |
| url | https://arxiv.org/abs/2109.06428 |