Relativistic Quantum Mechanics
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Feynman e as Integrais de Trajetória
Resumo O método de integrais de trajetória, desenvolvido por Feynman no artigo “Space-Time Approach to Non-Relativistic Quantum Mechanics” de 1948, é uma das formulações da teoria quântica que se junta, considerando a época do artigo, a duas anteriores: (i) a formulação, de certa forma o padrão apresentado em livros-textos, desenvolvida na déc
Rev. Bras. Ensino Fís.. Publicado em: 02/07/2018
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2. Comparing the Schrödinger and Dirac Descriptions of an Electron in a Uniform Magnetic Field
Abstract In this article we present a detailed description, using ladder operators, of an electron in a uniform magnetic field evolving under the Schrödinger equation. We go on to describe the same physical system in terms of relativistic quantum mechanics using the Dirac equation and to compare the two models in detail. The main differences between these t
Rev. Bras. Ensino Fís.. Publicado em: 11/06/2018
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3. Nonadditive entropy and nonextensive statistical mechanics -an overview after 20 years
Statistical mechanics constitutes one of the pillars of contemporary physics. Recognized as such - together with mechanics (classical, quantum, relativistic), electromagnetism and thermodynamics -, it is one of the mandatory theories studied at virtually all the intermediate-and advanced-level courses of physics around the world. As it normally happens with
Brazilian Journal of Physics. Publicado em: 2009-08
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4. Oscilador de Dirac: ImplicaÃÃes da violaÃÃo da simetria de Lorentz e da massa dependente da posiÃÃo.
In this work we study the Dirac Oscillator (DO) in a threefold way. In the first way, we study DO with Lorentz symmetry violation. This violation is implemented through vectorial and an axial terms. We realize a non-relativistic limit and we obtain that the background vector field does not modify the energy spectrum. However, in the case of the background ax
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/07/2008
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5. Thermodynamics properties of the Dirac oscillator and some contributions of the function theta of Jacobi / Propriedades termodinÃmicas do oscilador de Dirac e algumas contribuiÃÃes da funÃÃo theta de Jacobi
In this work we analyze the three-dimensional Dirac oscillator in a thermal bath. We found that the heat capacity is two times greather than the heat capacity of the one-dimensional Dirac oscillator in the higher temperatures. We begin with the energy spectrum of the three-dimensional Dirac oscillator, then we find the partition functions and others thermody
Publicado em: 2007
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6. Generalized classical and quantum dynamics within a nonextensive approach
On the basis of generalized classical kinetic equations, reproducing the stationary distribution of the Tsallis nonextensive thermostatistics, we formulate two generalized Schr¨odinger equations which satisfy the basic assumptions of the quantum mechanics under an appropriate generalization of the operator properties. Moreover, we study the generalization o
Brazilian Journal of Physics. Publicado em: 2005-06
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7. "Efeito Aharonov-Bohm não-comutativo para partículas relativísticas de spin 1/2" / Aharonov-Bohm effect for relativistic spin 1/2 particles
Este trabalho destina-se ao estudo de modificações no espalhamento de Aharonov-Bohm para partículas relativísticas com spin 1/2, devido à não comutatividade do espaço, em 2+1 dimensões. As correções para o potencial de Aharonov-Bohm, sendo muito singulares, levam, em geral, ao aparecimento de divergências na expansão perturbativa em torno da teor
Publicado em: 2005
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8. Introdução de um "Quantum" de tempo no formalismo da mecanica quantica
Discovered nearly a century ago, the electron is still a stranger in the context of classical electromagnetism. Many models have been proposed in order to describe it. In this sense, the most successful theory is the one proposed by Dirac in 1938, notwithstanding some drawbacks such as the existence of pre-accelerating and self-accelerating solutions. An alt
Publicado em: 1994
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9. Discrete wave mechanics: The hydrogen atom
The quantum mechanical problem of the hydrogen atom is treated by use of a finite difference equation in place of Schrödinger's differential equation. The exact solution leads to a wave vector energy expression that is readily converted to the Bohr-Rydberg formula. (The calculations here reported are limited to spherically symmetric states.) The wave vector