The authors investigate the role of the cosmological constant in the
formation of neutrino halos. Using the observational limit Λ ≤
10-55 cm-2 they find that it is relevant only for
neutrinos of very light rest-mass: namely, ≤10-1eV.
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Due to the present indications of the existence of a non-zero cosmological constant, some aspects of the influence of a Lambda not equal to zero on the character of test-particle motion in black-hole backgrounds are discussed. Equations of motion of electrically charged particles and magnetic monopoles are written in the most general Kerr-Newman-de Sitter dyon background. For the Kerr-de Sitter spacetime, the latitudinal motion is examined in detail by using the 'Chinese boxes' technique. The radial motion in the Schwarzschild-de Sitter background is considered with attention devoted to the existence and stability of circular orbits and to the properties of purely radial trajectories. Finally, the possibility of constructing an Einstein-Strauss-de Sitter model of the Universe (i.e. a model of Schwarzschild-de Sitter condensations in the Friedman Universe with a non-zero Lambda-term) is discussed.
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Due to the present indications of the existence of a non-zero
cosmological constant, some aspects of the influence of a Lambda not
equal to zero on the character of test-particle motion in black-hole
backgrounds are discussed. Equations of motion of electrically charged
particles and magnetic monopoles are written in the most general
Kerr-Newman-de Sitter dyon background. For the Kerr-de Sitter spacetime,
the latitudinal motion is examined in detail by using the 'Chinese
boxes' technique. The radial motion in the Schwarzschild-de Sitter
background is considered with attention devoted to the existence and
stability of circular orbits and to the properties of purely radial
trajectories. Finally, the possibility of constructing an
Einstein-Strauss-de Sitter model of the Universe (i.e. a model of
Schwarzschild-de Sitter condensations in the Friedman Universe with a
non-zero Lambda-term) is discussed.
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The latitudinal motion of an electrically charged particle in a dyon space-time described by the Kerr-Newman metric with both electric and magnetic charges is investigated. Due to duality invariance this description holds also for the motion of a magnetic monopole in a field of a dyon with appropriately chosen charges. The results are compared with a previous analysis of the test particle motion in the Kerr-Newman space-time.
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The latitudinal motion of an electrically charged particle in a dyon
space-time described by the Kerr-Newman metric with both electric and
magnetic charges is investigated. Due to duality invariance this
description holds also for the motion of a magnetic monopole in a field
of a dyon with appropriately chosen charges. The results are compared
with a previous analysis of the test particle motion in the Kerr-Newman
space-time.
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