Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1994-12-14
Commun. Math. Phys. 172 (1995) 427
Physics
High Energy Physics
High Energy Physics - Theory
LaTeX, 24 pages
Scientific paper
10.1007/BF02099435
A new construction using finite dimensional dual grassmannians is developed to study rational and soliton solutions of the KP hierarchy. In the rational case, properties of the tau function which are equivalent to bispectrality of the associated wave function are identified. In particular, it is shown that there exists a bound on the degree of all time variables in tau if and only if the wave function is rank one and bispectral. The action of the bispectral involution, beta, in the generic rational case is determined explicitly in terms of dual grassmannian parameters. Using the correspondence between rational solutions and particle systems, it is demonstrated that beta is a linearizing map of the Calogero-Moser particle system and is essentially the map sigma introduced by Airault, McKean and Moser in 1977.
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