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Liouville field theory is considered with boundary conditions corresponding to a quantization of the classical Lobachevskiy plane (i. e. euclidean version of AdS₂). We solve the bootstrap equations for the out-vacuum wave function and find an infinite set of solutions. This solutions are in one to one correspondence with the degenerate representations of the Virasoro algebra. Consistency of these solutions is verified by both boundary and modular bootstrap techniques. Perturbative calculations lead to the conclusion that only the ``basic'' solution corresponding to the identity operator provides a ``natural'' quantization of the Lobachevskiy plane.
Zamolodchikov et al. (Tue,) studied this question.