Equilibrium of Charges and Differential Equations Solved by Polynomials II

Abstract

We continue study of equilibrium of two species of 2d coulomb charges (or point vortices in 2d ideal fluid) started in (Igor Loutsenko, J. Phys. A: Math. Gen. 37, 1309, 2004). Although for two species of vortices with circulation ratio -1 the relationship between the equilibria and the factorization/Darboux transformation of the Schrodinger operator was established a long ago, the question about similar relationship for the ratio -2 remained unanswered. Here we present the answer: One has to consider Darboux-type transformations of third order differential operators rather than second order Schrodinger operators. Furthermore, we show that such transformations can also generate equilibrium configurations where an additional charge of a third specie is present. Relationship with integrable hierarchies is briefly discussed.

References in corpus (7)

• Vortices and Polynomials
• Equilibrium of charges and differential equations solved by polynomials
• Vortices ans Polynomials: Nonuniqueness of the Adler-Moser polynomials for the Tkachenko equation
• Point vortices and polynomials of the Sawada-Kotera and Kaup-Kupershmidt equations
• Integrable Dynamics of Charges Related to Bilinear Hypergeometric Equation
• The generalized Giambelli formula and polynomial KP and CKP tau-functions
• Periodic Vortex Streets and Complex Monodromy