General Relativity Physics
Mostrando 13-21 de 21 artigos, teses e dissertações.
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13. The anachronism of time : actual between Einstein and Bergson / O anacronismo do tempo : um debate atual entre Einstein e Bergson
The starting point of this thesis was the observation of people s reactions in face of the changes introduced to the concept of time by Theory of Relativity. The people I refer to are those who have common sense and who, in general, display a certain level of discomfort in what concerns the multiple measurements of time predicted in the theory. In reacting a
Publicado em: 2007
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14. Numerical simulations of the gravitational collapse of a massless scalar field / Simulações numericas do colapso gravitacional de um campo escalar sem massa
Esta dissertação trata de um problema de colapso gravitacional do campo escalar sem massa com simetria esférica, de acordo com as equações de Einstein com acoplamento mínimo. Desenvolvemos algoritmos simples mas com ajuste automático de refinamento para obter soluções numéricas. O refinamento é necessário para descrever os fenômenos do colapso.
Publicado em: 2007
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15. Models of disks and other self-gravitating structures in general relativity / Modelos de discos e outras estruturas auto-gravitantes em relatividade geral
Exact solutions of Einstein field equations that represent space-times with disklike matter distributions are constructed using the inverse method (image method). These solutions include static thin perfect uid disks with and without halos, static thin charged perfect uid disks and models of thin charged dust disks. New solutions in various coordinate system
Publicado em: 2006
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16. ESTADOS SEMICLÁSSICOS NA GRAVIDADE QUÂNTICA / SEMICLASSICAL STATES IN QUANTUM GRAVITY
Loop quantum gravity (LQG) is currently one of the most promising approaches to describing general relativity in quantum terms. One of its key issues is to detect in the quantum theory semiclassical states whose macroscopic properties are the same as those of specific configurations of the classical theory. In this dissertation, we begin by presenting the LQ
Publicado em: 2006
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17. O desenvolvimento das mecanicas não-euclidianas durante o seculo XIX / The development of non-Euclidean mechanics during 19th century
O objetivo deste trabalho é estudar como a mecânica foi influenciada pelo desenvolvimento da geometria não-euclidiana durante o século XIX. Este estudo parte das primeiras teorias das geometrias não-euclidianas, até o formalismo desenvolvido com a introdução da geometria diferencial não-euclidiana, e a geometrização da mecânica. Nesse contexto, e
Publicado em: 2006
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18. Non gravitational black holes
Analogue models of general relativity have recently been considered with great interest by the scientific community. They connect branches of physics as different as gravitation, condensed matter physics, electrodynamics, acoustics, and quantum field theory. One of the main expectations about such models lies on the possibility of testing in laboratory some
Brazilian Journal of Physics. Publicado em: 2004-12
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19. Geometria do espaço-tempo no interior de um sistema em transição de fases / Space-time geometry for a system in phase transition
São apresentadas soluções numéricas do sistema de equações diferenciais de Tolman-Oppenheimer- Volkov para um gás de partículas em transição de fases, no contexto da relatividade geral, encontrando a estrutura do espaço-tempo associada com a transição de fases. Para isto assumimos que o gás está formado por partículas autogravitantes, idênti
Publicado em: 2003
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20. Condensed Matter Physics as a laboratory for gravitation and Cosmology
The geometric language of General Relativity is not normally related to Condensed Matter (CM) Physics since it is the electromagnetic and not the gravitational interaction that dominates the physics of CM systems. What points in common would then CMP have with Cosmology and the dynamics of objects in a gravitational field? There is at least one that is very
Brazilian Journal of Physics. Publicado em: 2000-06
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21. An ancient revisits cosmology.
In this after-dinner speech, a somewhat light-hearted attempt is made to view the observational side of physical cosmology as a subdiscipline of astrophysics, still in an early stage of sophistication and in need of more theoretical understanding. The theoretical side of cosmology, in contrast, has its deep base in general relativity. A major result of obser