Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1995-12-18
Nucl.Phys. B471 (1996) 521-552
Physics
High Energy Physics
High Energy Physics - Theory
41 pages, LaTeX
Scientific paper
10.1016/0550-3213(96)00195-2
We demonstrate how negative powers of screenings arise as a nonperturbative effect within the operator approach to Liouville theory. This explains the origin of the corresponding poles in the exact Liouville three point function proposed by Dorn/Otto and $(\hbox{Zamolodchikov})^2$ (DOZZ) and leads to a consistent extension of the operator approach to arbitrary integer numbers of screenings of both types. The general Liouville three point function in this setting is computed without any analytic continuation procedure, and found to support the DOZZ conjecture. We point out the importance of the concept of free field expansions with adjustable monodromies - recently advocated by Petersen, Rasmussen and Yu - in the present context, and show that it provides a unifying interpretation for two types of previously constructed local observables.
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