Now showing items 31-40 of 58
As Simetrias de Lie de um Pião
(Sociedade Brasileira de Física, 2018)
The existence of symmetries in differential equations can generate transformations of dependent and independent variables that facilitate the integration of these equations. In the nineteenth century, Sophus Lie developed ...
Aplicações das simetrias de Lie na dinâmica de sistemas mecânicos
(Universidade Estadual Paulista (UNESP), 2018-04-20)
Os métodos envolvendo simetria têm grande importância para o estudo das equações diferenciais decorrentes de áreas como a matemática, física, engenharia entre muitas outras. A existência de simetrias em equações diferenciais ...
Conserved currents in gravitational models with quasi-invariant Lagrangians: Application to teleparallel gravity
(Amer Physical Soc, 2006-11-01)
Conservation laws in gravitational theories with diffeomorphism and local Lorentz symmetry are studied. Main attention is paid to the construction of conserved currents and charges associated with an arbitrary vector field ...
The interplay between helicity and rotation in turbulence: Implications for scaling laws and small-scale dynamics
(The Royal Society, 2010-04)
Invariance properties of physical systems govern their behaviour: energy conservation in turbulence drives a wide distribution of energy among modes, as observed in geophysical or astrophysical flows. In ideal hydrodynamics, ...
Numerical and analytical tests of quasi-integrability in modified sine-Gordon models
Following our attempts to define quasi-integrability in which we related this concept to a particular symmetry of the two-soliton function we check this condition in three classes of modified sine-Gordon models in (1+1) ...
Massless DKP field in a Lyra manifold
(Iop Publishing Ltd, 2007-02-07)
Massless scalar and vector fields are coupled to the Lyra geometry by means of the Duffin-Kemmer-Petiau (DKP) theory. Using the Schwinger variational principle, the equations of motion, conservation laws and gauge symmetry ...