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7 papers · 1 filter
Remarks on a solvable cosmological model
Ion I. Cotaescu, Dumitru N. Vulcanov
We present an exact analytical solution of the Einstein equations with cosmological constant in a spatially flat Robertson-Walker metric. This is interpreted as an isotropic Lemait…
Polarized Dirac fermions in de Sitter spacetime
Ion I. Cotaescu
The tetrad gauge invariant theory of the free Dirac field in two special moving charts of the de Sitter spacetime is investigated pointing out the operators that commute with the D…
Hierarchy of Dirac, Pauli and Klein-Gordon conserved operators in Taub-NUT background
Ion I. Cotăescu, Mihai Visinescu
The algebra of conserved observables of the SO(4,1) gauge-invariant theory of the Dirac fermions in the external field of the Kaluza-Klein monopole is investigated. It is shown tha…
Non-existence of f-symbols in generalized Taub-NUT spacetimes
Ion I. Cotăescu, Mihai Visinescu
In a previous article it was proved that the extensions of the Taub-NUT geometry do not admit Killing-Yano tensors, even if they possess St\" {a}ckel-Killing tensors. Here the anal…
Geodesics on extensions of Lie groups and stability; the superconductivity equation
Cornelia Vizman
The equations of motion of a charged ideal fluid, respectively the superconductivity equation (both in a given magnetic field) are showed to be geodesic equations on a general, res…
Dynamical algebra and Dirac quantum modes in Taub-NUT background
Ion I. Cotăescu, Mihai Visinescu
The SO(4,1) gauge-invariant theory of the Dirac fermions in the external field of the Kaluza-Klein monopole is investigated. It is shown that the discrete quantum modes are governe…