Results 31 to 40 of about 211 (74)
Covariant Quantization Of Green Schwarz Superstring [PDF]
Proceedings of XIV National Meeting of Particles and Fields,
Brazil. Ed. Adilson J. Da Silva et al, p. 1-23. Sociedade Brasileira de
Fisica. (1994), 1993 We describe a canonical covariant approach to the quantization of the Green-Schwarz superstring. The approach is first applied to the canonical covariant quantization of the Brink and Schwarz superparticle. The Kallosh action is obtained in this case, with the correct BRST cohomology.
arxiv
Mecanica Relacional: A proposito de uma resenha [PDF]
Revista Brasileira de Ensino de Fisica vol. 23 (3), 260 (2001), 2001 We present a critical analysis of what is called Relational Mechanics, as it has been presented in a book thus entitled, which has been recently reviewed in this journal.
arxiv
Chaos in undamped, forced oscillators via stroboscopic maps [PDF]
Revista Brasileira de Ensino de F\'isica, vol. 46, e20240229
(2024)Non-linear dynamics is not a usually covered topic in undergraduate physics courses. However, its importance within classical mechanics and the general theory of dynamical systems is unquestionable. In this work we show that this subject can be included in the schedule of an introductory classical mechanics course without the need to develop a robust ...
arxiv +1 more source
The invention of the quantum energy concept according to Planck [PDF]
Revista Brasileira de Ensino de Fisica, 22 (4), 523-535 (2000), 2001 A hundred years ago, the quantum concept provoked a revolution in science and the search of a new conceptual basis for whole physics, as emphasized by Einstein. In this paper, I discuss the essential features of Planck's works in 1900 on the blackbody radiation and the hypothesis of energy quantization.
arxiv
An analytically solvable three-body problem [PDF]
arXiv, 2001 The problem of three particles interacting through harmonic forces is discussed within the Newtonian formalism. By means of a didactic approach, an exact analytical solution is found, and ways to extend it to the N-body case are pointed out.
arxiv
Bulk viscosity and deflationary universes [PDF]
Rev.Bras.Fis.20:187-194,1990, 2007 We analyze the conditions that make possible the description of entropy generation in the new inflationary model by means of a nearequilibrium process. We show that there are situations in which the bulk viscosity cannot describe particle production during the coherent field oscillations phase.
arxiv
Propriétés dynamiques génériques des homéomorphismes conservatifs [PDF]
arXiv, 2012 This memoir is concerned with the generic dynamical properties of conservative homeomorphisms of compact manifolds. Several important techniques allowing to prove genericity results are presented: we emphasize the important role played by periodic approximations of homeomorphisms, and by the embedding of the space of homeomorphisms in the space of bi ...
arxiv
Application of FCI at engineering students in Bogota: an interpretation of the answers through a random model of two levels [PDF]
arXiv, 2012 We applied the FCI to 646 engineering students from Bogota when they began your first year physics, we found that the relative frequency of the number of correct answers has a random pattern of two levels, also we found that they don't have clear mental models about physical world.
arxiv
On the Dirac Monopole Mass Scale [PDF]
Revista Brasileira de F\'isica 16 (2), p. 188-193, 1986, 2013 It is shown, by a semi-classical argument, that the Dirac charge quantization is still valid in the (classical) Born-Infeld electromagnetic theory. Then it is possible to calculate Dirac's monopole mass in the framework of this theory, which is not possible in Maxwell's theory.
arxiv
, 2013 A exposição humana à água contaminada por material fecal, seja por ingestão ou por atividades recreacionais, é importante mecanismo de transmissão de patógenos gastrintestinais, sendo a Escherichia coli considerada um dos principais patógenos ...
Gomes, Fátima de Cássia Oliveira +2 more
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