A. Gerasimov et al., LIOUVILLE TYPE MODELS IN THE GROUP-THEORY FRAMEWORK .1. FINITE-DIMENSIONAL ALGEBRAS, International journal of modern physics A, 12(14), 1997, pp. 2523-2583
In this series of papers we represent the ''Whittaker'' wave functiona
l of the (d + 1)-dimensional Liouville model as a correlator in (d + 0
)-dimensional theory of the sine-Gordon type (for d = 0 and 1). The as
ymptotics of this wave function is characterized by the Harish-Chandra
function, which is shown to be a product of simple Gamma function fac
tors over all positive roots of the corresponding algebras (finite-dim
ensional for d = 0 and affine for d = 1). This is in nice corresponden
ce with the recent results on two- and three-point correlators in the
1 + 1 Liouville model, where emergence of peculiar double periodicity
is observed. The Whittaker wave functions of (d + 1)-dimensional nonaf
fine (''conformal'') Toda type models are given by simple averages in
the (d + 0)-dimensional theories of the affine Toda type. This phenome
non is in obvious parallel with representation of the free field wave
functional, which was originally a Gaussian integral over the interior
of a (d + 1)-dimensional disk with given boundary conditions, as a (n
onlocal) quadratic integral over the d-dimensional boundary itself. In
this paper we concentrate on the finite-dimensional case. The results
for finite-dimensional ''Iwasawa'' Whittaker functions are known, and
we present a survey. We also construct new ''Gauss'' Whittaker functi
ons.