Jan Derezinski
Van Hove Hamiltonians---exactly solvable models of the infrared
and ultraviolet problem.
(62K, LATeX 2e)

ABSTRACT.  Quadratic bosonic Hamiltonians with a linear perturbation are studied.
Depending on the infrared and ultraviolet behavior of the
perturbation, their properties  are described from the point of view of
spectral and scattering theory.