Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1994-06-14
J.Math.Phys. 36 (1995) 4863-4881
Physics
High Energy Physics
High Energy Physics - Theory
22 pgs, AMSTeX, preprint CRM-2889 (1994)
Scientific paper
10.1063/1.531351
The Painlev\'e transcendents $P_{\rom{I}}$--$P_{\rom{V}}$ and their representations as isomonodromic deformation equations are derived as nonautonomous Hamiltonian systems from the classical $R$--matrix Poisson bracket structure on the dual space $\wt{\frak{sl}}_R^*(2)$ of the loop algebra $\wt{\frak{sl}}_R(2)$. The Hamiltonians are obtained by composing elements of the Poisson commuting ring of spectral invariant functions on $\wt{\frak{sl}}_R^*(2)$ with a time--dependent family of Poisson maps whose images are $4$--dimensional rational coadjoint orbits in $\wt{\frak{sl}}_R^*(2)$. Each system may be interpreted as describing a particle moving on a surface of zero curvature in the presence of a time--varying electromagnetic field. The Painlev\'e equations follow from reduction of these systems by the Hamiltonian flow generated by a second commuting element in the ring of spectral invariants.
Harnad John
Routhier M.
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