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Master's Dissertation
DOI
https://doi.org/10.11606/D.55.2022.tde-25042022-131052
Document
Author
Full name
Hermes Alves Neto
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2022
Supervisor
Committee
Jordão, Thaís (President)
Araujo, Gustavo da Silva
Bracciali, Cleonice Fatima
Peron, Ana Paula
Title in Portuguese
Universalidade para medidas Stahl-Totik regulares
Keywords in Portuguese
Funções de Christoffel
Medidas Stahl-Totik regulares
Polinômios ortogonais
Universalidade
Abstract in Portuguese
Em 2009, Lubinsky provou um limite de universalidade, antes conhecido em poucos casos, para uma grande família de medidas, as medidas Stahl-Totik regulares. Os polinômios ortogonais foram utilizados de forma original na obtenção de tal limite, através da localização das funções de Christoffel. O processo envolve aproximar núcleos reprodutores associados a medidas Stahl- Totik regulares ao núcleo reprodutor do peso de Legendre. Como o limite de universalidade é conhecido para o peso de Legendre, estas aproximações permitem a obtenção do resultado para a classe de medidas que trabalharemos. A universalidade a ser explorada neste trabalho tem como origem um modelo de matrizes aleatórias chamado de Ensemble Gaussiano Unitário, cuja distribuição de probabilidade pode ser escrita em termos do núcleo reprodutor associado aos polinômios de Hermite. De maneira geral, núcleos reprodutores associados a polinômios ortogonais definem um modelo estatístico chamado processo pontual determinante. É neste contexto geral que será explorado o limite de universalidade.
Title in English
Universality for Stah-Totik regular measures
Keywords in English
Christoffel functions
Orthogonal polynomials
Stahl-Totik regular measures
Universality
Abstract in English
In 2009, Lubinsky proved an universality limit, before known only in a few cases, for a large class of measures, the Stahl-Totik regular measures. Orthogonal polynomials were used in a original way to obtain this limit, using localization properties of Christoffel Functions. The process involves approximating the reproducing kernels of Stahl-Totik regular measures to the Legendre weight reproducing Kernel. As the universality limit is known for the Legendre weight, the same goes for the measures that we are interested. The universality to be studied in this work has its origns in a random matrix model, the Gaussian Unitary Ensemble, which its probability distribution can be obtained in terms of the reproducing kernel associated to Hermite polynomials. In a general way, reproducing kernels of orthogonal polynomials define a stathistical model called determinantal point process. It is in this scenario that the universality limit will be explored in this work
 
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Publishing Date
2022-04-25
 
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