Joerg Teschner

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Liouville theory seems to be a kind of universal building block for a variety of models for two-dimensional gravity and non-trivial backgrounds in string theory. Some aspects of it were important for understanding what the matrix models of 2D gravity actually describe (see e.g. [GM]), and it keeps popping up in sometimes unexpected circumstances such as the(More)
The bootstrap for Liouville theory with conformally invariant boundary conditions will be discussed. After reviewing some results on one-and boundary two-point functions we discuss some analogue of the Cardy condition linking these data. This allows to determine the spectrum of the theory on the strip, and illustrates in what respects the bootstrap for(More)
In this work we propose an exact microscopic description of maximally symmetric branes in a Euclidean AdS 3 background. As shown by Bachas and Petropoulos, the most important such branes are localized along a Euclidean AdS 2 ⊂ AdS 3. We provide explicit formulas for the coupling of closed strings to such branes (boundary states) and for the spectral density(More)
We investigate two classes of D-branes in 2-d string theory, corresponding to extended and localized branes, respectively. We compute the string emission during tachyon condensation and reinterpret the results within the c = 1 matrix model. As in hep-th/0304224, we find that the extended branes describe classical eigenvalue trajectories, while, as found in(More)
The recently proposed expression for the general three point function of exponential fields in quantum Liouville theory on the sphere is considered. By exploiting locality or crossing symmetry in the case of those four-point functions, which may be expressed in terms of hypergeometric functions, a set of functional equations is found for the general three(More)
We study certain relevant boundary perturbations of Liouville theory and discuss implications of our results for the brane dynamics in noncritical string theories. Our results include (i) There exist monodromies in the parameter μB of the Neumann-type boundary condition that can create an admixture represented by the Dirichlet type boundary condition, for(More)
We reconsider the construction of exponential fields in the quantized Liouville theory. It is based on a free-field construction of a continuous family or chiral vertex operators. We derive the fusion and braid relations of the chiral vertex operators. This allows us to simplify the verification of locality and crossing symmetry of the exponential fields(More)