Asymptotic Analysis of Structured Determinants Via the Riemann-Hilbert Approach
Abstract
In this work we use and develop Riemann-Hilbert techniques to study the asymptotic behavior of structured determinants. In chapter one we will review the main underlying definitions and ideas which will be extensively used throughout the thesis. Chapter two is devoted to the asymptotic analysis of Hankel determinants with Laguerre-type and Jacobitype potentials with Fisher-Hartwig singularities. In chapter three we will propose a RiemannHilbert problem for Toeplitz+Hankel determinants. We will then analyze this RiemannHilbert problem for a certain family of Toeplitz and Hankel symbols. In Chapter four we will study the asymptotics of a certain bordered-Toeplitz determinant which is related to the next-to-diagonal correlations of the anisotropic Ising model. The analysis is based upon relating the bordered-Toeplitz determinant to the solution of the Riemann-Hilbert problem associated to pure Toeplitz determinants. Finally in chapter five we will study the emptiness formation probability in the XXZ-spin 1/2 Heisenberg chain, or equivalently, the asymptotic analysis of the associated Fredholm determinant.
Degree
Ph.D.
Advisors
Its, Purdue University.
Subject Area
Mathematics|Statistical physics
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