Raising operators for the Whittaker wave functions of the Toda chain and intertwining operators

Abstract

Intertwiners between  representations of Lie groups can be used to obtain relations for matrix elements. We apply this technique to obtain different identities for the wave functions of the open Toda chain, in particular raising operators  and bilinear relations for the wave functions at different energy levels. We also recall the  group theory approach to the Toda chain: treating the wave functions as matrix elements in irreducible representations between the so-called Whittaker vectors, integral representations of the wave functions, etc.