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61 papers · 1 filter
Bianchi type IX world with torsion and shear
L. C. Garcia de Andrade, G. A. Monerat
Oscillating phases in Bianchi type IX anisotropic universes are obtained as linearized solutions of Einstein-Cartan theory of gravity.Instead of making use of Weyssenhoff spinning…
Measuring the Lyapunov exponent using quantum mechanics
F. M. Cucchietti, C. H. Lewenkopf, E. R. Mucciolo +2
We study the time evolution of two wave packets prepared at the same initial state, but evolving under slightly different Hamiltonians. For chaotic systems, we determine the circum…
Remarks on monopoles in Abelian projected continuum Yang-Mills theories
A. R. Fazio, S. P. Sorella
A possible mechanism accounting for monopole configurations in continuum Yang-Mills theories is discussed. The presence of the gauge fixing term is taken into account.
Higher Order Evaluation of the Critical Temperature for Interacting Homogeneous Dilute Bose Gases
Frederico F. de Souza Cruz, Marcus B. Pinto, Rudnei O. Ramos +1
We use the nonperturbative linear δexpansion method to evaluate analytically the coefficients c_1 and c_2^{\prime \prime} which appear in the expansion for the transition temperatu…
Cosmological Background torsion limits from Lorentz violation
L. C. Garcia de Andrade
Cosmological limits on Lorentz invariance breaking in Chern-Simons electrodynamics are used to place limits on torsion. Birefrigence phenomena is discussed by u…
Cosmic Rotation Axis, Birefrigence and Axions to detect Primordial torsion fields
L. C. Garcia de Andrade
Nodland Ralston (PRL,1997) investigated the cosmological anisotropy of electromagnetic fields.In this paper we show that it is possible obtain a torsion correction to Nodland-Ralst…