Noncommutativity
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Fibras cuánticas para sistemas clásicos: introducción a la cuantificación geométrica
In this article, We shall introduce the formalism of canonical quantization called "geometric quantization". Since this formalism let us understand quantum mechanics as a geometric extension of classical mechanics, we shall identify the insufficiencies of the latter that are resolved by such an extension. We shall show that geometric quantization permits us
Sci. stud.. Publicado em: 2013-03
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2. Pode a não-comutatividade do espaço indicar a dependência funcional da entropia com a área
Calculation of the entropy of black holes is an open subject. Such problem is very interesting due to its relationship with basic problems like; the construction of a quantum theory of the gravity, statistical approach of the calculation of black holes entropy and the validity (or non validity) of the holographic principle. In this work we are looking for a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 22/10/2009
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3. Low-energy parabosonic membrane: new critical dimensions and deformed noncommutativity
We study a classical perturbative membrane based on the string-limit model and we discuss the consistency of the theory where the closure of the classical constraints algebra is verified. We paraquantize the model (extended string) both in the covariant and the transverse approaches. From the generalized Poincaré algebra, the so-called Poincaré (para) alge
Brazilian Journal of Physics. Publicado em: 2009-12
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4. Modified symplectic structures in cotangent bundles of lie groups
In earlier work [1], we studied an extension of the canonical symplectic structure in the cotangent bundle of an affine space Q = R N, by additional terms implying the Poisson non-commutativity of both configuration and momentum variables. In this article, we claim that such an extension can be done consistently when Q is a Lie group G.
Brazilian Journal of Physics. Publicado em: 2009-03
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5. Unitarity in Noncommutative Field Theories / Unitariedade em teorias não comutativas
Este trabalho é dedicado ao estudo da unitariedade em teoria de campos não comuta- tiva. Inicialmente, são apresentadas as ferramentas básicas para abordar o problema da unitariedade em teorias não comutativas, incluindo as regras de corte e uma introdução à não comutatividade. Em seguida, foi feita a análise do modelo Á3 não comutativo. Empregan
Publicado em: 2009
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6. Noncommutative configuration space: classical and quantum mechanical aspects
In this work we examine noncommutativity of position coordinates in classical symplectic mechanics and its quantisation. In coordinates {q i,p k} the canonical symplectic two-form is omega0 = dq i
Brazilian Journal of Physics. Publicado em: 2006-03
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7. Physics of deformed special relativity: relativity principle revisited
In many different ways, Deformed Special Relativity (DSR) has been argued to provide an effective limit of quantum gravity in almost-flat regime. Unfortunately, DSR is up to now plagued by many conceptual problems (in particular how it describes macroscopic objects) which forbids a definitive physical interpretation and clear predictions. Here we propose a c
Brazilian Journal of Physics. Publicado em: 2005-06
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8. The classical and commutative limits of noncommutative quantum mechanics: a superstar * Wigner-Moyal equation
We are interested in the similarities and differences between the quantum-classical (Q-C) and the noncommutative-commutative (NC-Com) correspondences. As one useful platform to address this issue we derive the superstar Wigner-Moyal equation for noncommutative quantum mechanics (NCQM). A superstar *-product combines the usual phase space * star and the nonco
Brazilian Journal of Physics. Publicado em: 2005-06
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9. Noncommutative field theory
Noncommutative field theories present many surprising properties. As a consequence of the noncommutativity, high momentum modes do not decouple from the physics at large distances leading to the appearance of infrared singularities even in theories without massless particles. Being nonintegrable, these infrared singularities destroy the usual perturbative ex
Brazilian Journal of Physics. Publicado em: 2002-12
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10. Nonequilibrium entropy, Lyapounov variables, and ergodic properties of classical systems
We discuss the problem of defining (nonequilibrium) entropy in terms of the concepts of mechanics and of reconciling its monotonic increase with the Hamiltonian evolution of the dynamical system. This leads to investigating necessary and sufficient conditions for the existence of monotonically increasing quantities or the so-called Lyapounov variables of cla