Algebraic K-Theory and Partition Functions in Conformal Field Theory

Physics – High Energy Physics – High Energy Physics - Theory

Scientific paper

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153 pages; minor changes to PhD thesis

Scientific paper

Certain integrable models are described by pairs (X,Y) of ADET Dynkin diagrams. At high energy these models are expected to have a conformally invariant limit. The S-matrix of the model determines algebraic equations, whose solutions are mapped to the central charge and scaling dimensions of the corresponding conformal field theory. We study the equations of the (D_m,A_n) model and find all solutions explicitly using the representation theory of Lie algebras and related Yangians. These mathematically rigorous results are in agreement with the expectations arising from physics. We also investigate the overlap between certain q-hypergeometric series and modular functions. We study a particular class of 2-fold q-hypergeometric series, denoted f_{A,B,C}. Here A is a positive definite, symmetric, 2x2 matrix, B is a vector of length 2, and C is a scalar, all three with rational entries. It turns out that for certain choices of the matrix A, the function f_{A,B,C} can be made modular. We calculate the corresponding values of B and C. It is expected that functions f_{A,B,C} arising in this way are characters of some rational conformal field theory. We show that this is true in at least one case.

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