Two topics in 2D quantum field theory

• Main Author: Rivlis, Gil
• Format: Others
• Language: en
• Published: 1991
• Online Access: https://thesis.library.caltech.edu/6287/1/Rivlis_g_1991.pdf; Rivlis, Gil (1991) Two topics in 2D quantum field theory. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/w269-sg43. https://resolver.caltech.edu/CaltechTHESIS:04112011-105901546 <https://resolver.caltech.edu/CaltechTHESIS:04112011-105901546>

Two topics in two-dimensional quantum field theory are presented. The first is a classification of 2- and 3-field rational conformal field theories. Using the fact that the fusion algebra of a RCFT is specified in terms of integers that are related to modular transformation properties, we classify 2- and 3-field chiral RCFT's. We show that the only possibilities for the non-trivial fusion rule in the 2-field case are φ x φ = 1 or φ x φ = 1 + φ. Similar results are obtained for the 3-field case. A partial classification of possible conformal dimensions and central charges for these theories is also obtained. The second topic is in two-dimensional quantum gravity. Explicit computation of the non-perturbative correlation functions of the (1, q) models of KdV-gravity is presented. This computation includes contributions from high genus as well as correlation functions of descendant fields. A ghost number conservation law for these models is derived from purely algebraic considerations. A hint of further selection rules is found.