Quantum Chaos
Mostrando 13-19 de 19 artigos, teses e dissertações.
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13. Bilhares quanticos como modelo para um gas mesoscopico magnetizado
During the last years, mesoscopic systems have been attracting much interest in Theoretical Physics, due to the implementation of important theories in this field such as the semiclassical theory of periodic, classical, orbits. The recent progresses in experimental techniques, in semiconductor materials, showed that the manipulation of real systems with as f
Publicado em: 1998
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14. Correções Quânticas 1/N ao Limite Clássico: Aplicação ao Modelo de Lipkin SU(2) / Quantum corrections 1 / N the classical limit: Application to the Lipkin model SU(2)
Neste trabalho mostramos de que maneira o princípio variacional dependente do tempo pode ser usado para se estudar correções quânticas ao limite clássico, particularmente, no contexto do modelo de Lipkin SU(2). Mostramos que tais correções podem ser colocadas na forma Hamiltoniana, acoplando-se a dinâmica clássica um conjunto de variáveis associada
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/07/1997
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15. Manifestações do caos no modelo do Maser de Dicke
We study the effects of nonintegrability in the Dicke Maser Model by observing the modifications in the patterns of distribution of expectation values in the energy eigenstates of some selected operators plotted against energy eigenvalues. The semiclassical density of states and the mean values of observables in the microcanonical ensemble are obtained and c
Publicado em: 1995
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16. Random matrices and quantum chaos
The theory of random matrices has far-reaching applications in many different areas of mathematics and physics. In this note, we briefly describe the state of the theory and two of the perhaps most surprising appearances of random matrices, namely in the theory of quantum chaos and in the theory of prime numbers.
The National Academy of Sciences.
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17. Embracing Chaos and Complexity: A Quantum Change for Public Health
Public health research and practice have been guided by a cognitive, rational paradigm where inputs produce linear, predictable changes in outputs. However, the conceptual and statistical assumptions underlying this paradigm may be flawed. In particular, this perspective does not adequately account for nonlinear and quantum influences on human behavior. We p
American Public Health Association.
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18. Titration of chaos with added noise
Deterministic chaos has been implicated in numerous natural and man-made complex phenomena ranging from quantum to astronomical scales and in disciplines as diverse as meteorology, physiology, ecology, and economics. However, the lack of a definitive test of chaos vs. random noise in experimental time series has led to considerable controversy in many fields
The National Academy of Sciences.
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19. Symmetry in chemistry from the hydrogen atom to proteins
The last 2 decades have seen discoveries in highly excited states of atoms and molecules of phenomena that are qualitatively different from the “planetary” model of the atom, and the near-rigid model of molecules, characteristic of these systems in their low-energy states. A unified view is emerging in terms of approximate dynamical symmetry princip
The National Academy of Sciences of the USA.