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Doctoral Thesis
DOI
10.11606/T.43.1995.tde-28022014-111310
Document
Author
Full name
Fabiane Avena de Oliveira
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 1995
Supervisor
Committee
Nemes, Maria Carolina (President)
Nielsen, Marina
Padula, Sandra dos Santos
Thomaz, Maria Teresa Climaco dos Santos
Veit, Eliane Angela
Title in Portuguese
Consequências macroscopicas de algumas propriedades da QCD
Keywords in Portuguese
Cromodinâmica quântica
Física de partículas
Abstract in Portuguese
No presente trabalho, investigamos algumas propriedades da qcd quando incorporadas aos modelos efetivos. Mostramos que muitas propriedades da materia densa quente ou fria podem ser melhor descritas a partir do modelo quiral SIGMA-OMEGA. Mostramos que, em contraste com o modelo renormalizado de walecka, as correcoes de vacuo sao cruciais para uma adequada descricao da materia nuclear densa. Estes resultados tambem sao confirmados a partir das previsoes feitas para estrelas de neutrons. Um possivel sinal da transicao de fase em colisoes de ions pesados relativisticos e tambem calculado pela observacao das taxas de decaimento do pion nos canais PI POT.-SETAMU POT. -+NU IND.MU e PI POT.-SETAVARRHO POT.-+SETAVARRHO POT.-+NU IND.VARRHO. Mostramos que as propriedades de confinamento e liberdade assintotica, incorporadas pelo modelo de sacola do mit, dao suporte para a especulacao da possivel existencia de estrelas hibridas
Title in English
Consequences of some macroscopic properties of QCD
Keywords in English
Particle physics
Quantum chromodynamics
Abstract in English
In this work we investigate some properties of QCD as incorporated in effective models. We show that several properties of cold or hot and dense nuclear matter can be well described in the context of the chiral - model. We show that, in contrast to the nom chiral Walecka model vacuum renormalization corrections are crucial to provide for an adequate description. This result is also confirmed in the description of neutron stars. A possible signature of chiral phase transition in RHI collisions is also pointed out in the observation of the ratio of pion decay in the two channels POT. POT. + IND. and POT. e POT. + IND. e. We also show that the properties of confinement and asymptotic freedom as incorpored by the Bag model give support to the speculation on the existence of hybrid stars.
 
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Publishing Date
2014-02-28
 
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