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Doctoral Thesis
DOI
https://doi.org/10.11606/T.43.1998.tde-26022014-094129
Document
Author
Full name
Van Sérgio da Silva Alves
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 1998
Supervisor
Committee
Gomes, Marcelo Otavio Caminha (President)
Carneiro, Carlos Eugenio Imbassahy
Frenkel, Josif
Marino, Eduardo Cantera
Souza, Carlos Farina de
Title in Portuguese
Análise Perturbativa de Campos Fermiônicos com Auto-Interação Quártica Acoplados a um Campo de Chern-Simons
Keywords in Portuguese
Física de partículas
Teoria de campos
Abstract in Portuguese
Neste trabalho fazemos uma análise perturbativa para férmions com autointeração quártica acoplados com um campo de Chern-Simons (CS). Calculamos as funções do grupo de renormalização até a ordem de 2-loops, válidas no limite de baixas energias: usando a regularização dimensional para tornar as amplitude de Feynaman finitas. Para a teoria com único sabor (N = 1), verificamos que operadores com dimensão (d) três adquirem uma dimensão anômala que é uma função decrescente do parâmetro de CS () que indica um melhor comportamento ultravioleta. Essa teoria apresenta apenas: a origem como ponto fixo, que é estável no infra-vermelho. Para o caso (N > 1}) usando o método de redução das constantes de acoplamento, encontramos, em ordem mais baixa, uma linha de pontos fixos para qualquer valor do acoplamento quártico. Verificamos que para > a teoria é estável no infra-vermelho.No processo de renormalização de operadores com d = 4, encontramos uma combinação linear dos operadores cuja dimensão também diminui como função de .
Title in English
Perturbative Analysis of Fermionic Fields with Quartic Self-Interaction Coupled to a Chern-Simons Field
Keywords in English
Field theory
Particle physics
Abstract in English
In this work a theory of fermionic fields coupled through a quartic self interaction and also interacting with a Chern-Sirnons field (CS) is perturbatively analyzed. Up two loops, renormalization group parameters were calculated using dimensional renormalization as a tool to render finite the Feynman amplitudes. For the theory with just one flavor (N = 1), we verified that operators with dimension (d) lower or equal to three have an anomalous dimension which decreases as a function of the CS parameter (); that indicates a better ultraviolet behavior. The theory presents the origin as the only fixed point which turns out to be infrared stable. For the case N > 1, using a method of reduction of coupling parameters, we Found, in lowest order a line of fixed points, We verified that of > the theory is stable in the infrared. In the renormalization process of operators with d = 4.We found a linear combination of (equation) whose dimension also deereases as a funection of .
 
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Publishing Date
2014-02-26
 
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