Exactly solvable nonlinear eigenvalue problems

A Class of Exactly-Solvable Eigenvalue Problems

The class of differential-equation eigenvalue problems −y′′(x)+x2N+2y(x) = xNEy(x) (N = −1, 0, 1, 2, 3, . . .) on the interval −∞ < x < ∞ can be solved in closed form for all the eigenvalues E and the corresponding eigenfunctions y(x). The eigenvalues are all integers and the eigenfunctions are all confluent hypergeometric functions. The eigenfunctions can be rewritten as products of polynomial...

Quasi - exactly solvable models in nonlinear optics

We study a large class of models with an arbitrary (finite) number of degrees of freedom, described by Hamiltonians which are polynomial in bosonic creation and annihilation operators, and including as particular cases n-th harmonic generation and photon cascades. For each model, we construct a complete set of commuting integrals of motion of the Hamiltonian, fully characterize the common eigen...

Quasi-Exactly-Solvable Many-Body Problems

First known examples of quasi-exactly-solvable N -body problems on the line are presented. These are related to the hidden algebra slN , and they are of two types – containing up to N and up to 6 body interactions only. Both types degenerate to the Calogero model. E-mail: [email protected] E-mail: [email protected] On leave of absence from the Institute for Theoretical and E...

Nonlinear Eigenvalue Problems

Heinrich Voss Hamburg University of Technology 115.1 Basic Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115-2 115.2 Analytic matrix functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115-3 115.3 Variational Characterization of Eigenvalues . . . . . . . . 115-7 115.4 General Rayleigh Functionals . . . . . . . . . . . . . . . . . . . ...

Solving nonlinear eigenvalue problems