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Master's Dissertation
DOI
https://doi.org/10.11606/D.43.2006.tde-08062015-152226
Document
Author
Full name
Bruno André Charneski
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2006
Supervisor
Committee
Gomes, Marcelo Otavio Caminha (President)
Escobar, Bruto Max Pimentel
Teotonio Sobrinho, Paulo
Title in Portuguese
Três diferentes abordagens não-comutativas aos modelos de Gross-Neveu e Sigma não-linear na expansão perturbativa 1/N
Keywords in Portuguese
Física
Teoria quântica de campos
Teorias não-comutativas
Abstract in Portuguese
Neste trabalho estudamos os modelos de Gross-Neveu e Sigma Não-Linear empregando a expansão 1/N no espaço não-comutativo. Consideramos três formalismos distintos para implementar a não-comutatividade. Dois deles tratam a não-comutatividade através da deformação do produto entre funções, porém, um dos formalismos é invariante de Lorentz e o outro não. O terceiro método trata a não-comutatividade através dos estados coerentes. Nesses diferentes contextos, calculamos o propagador do campo auxiliar de ambos os modelos, além da correção radiativa para o propagador do campo básico no modelo Sigma Não-Linear.
Title in English
Three different approaches to non-commutative Gross-Neveu and nonlinear sigma models in the 1 / N perturbative expansion
Keywords in English
Non-commutative theories
Physics
Quantum field theory
Abstract in English
ln this work we studied the Gross-Neveu and nonlinear sigma models employing the 1/N expansion in the non-commutative espace. We describe three different manner of introduce non-commutativity. Two of them treat the non-commutativity through the deformation of the product of functions, however one of the method is Lorentz invariant and the other not. The third manner treat the non-commutativity through coherent states. We calculated the propagator of the auxiliary field in both models in these different settings and, besides that, we compute the leading radiative correction to propagator of the basic field of the nonlinear sigma model.
 
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Charneski_2006.pdf (4.27 Mbytes)
Publishing Date
2015-06-17
 
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