منابع مشابه
De Sitter and Schwarzschild-de Sitter According to Schwarzschild and De Sitter
When de Sitter first introduced his celebrated spacetime, he claimed, following Schwarzschild, that its spatial sections have the topology of the real projective space IRP 3 (that is, the topology of the group manifold SO(3)) rather than, as is almost universally assumed today, that of the sphere S. (In modern language, Schwarzschild was disturbed by the non-local correlations enforced by S geo...
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The entropy for a black hole in a de Sitter space is approached within the framework of spacetime foam. A simple model made by N wormholes in a semiclassical approximation, is taken under examination to compute the entropy for such a case. An extension to the extreme case when the black hole and cosmological horizons are equal is discussed.
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Spinning of particles in SdS and SAdS space-times with effective cosmological constant is discussed in details. It is shown that the equilibrium conditions are independent of the spin of the test particles and are satisfied only for particular conditions relating the Einstein’s cosmological constant with the ultra-light masses implemented in the theory from supergravities arguments and non-mini...
متن کاملScalar Synchrotron Radiation in the Schwarzschild-anti-de Sitter Geometry
We present a complete relativistic analysis for the scalar radiation emitted by a particle in circular orbit around a Schwarzschild-antide Sitter black hole. If the black hole is large, then the radiation is concentrated in narrow angleshigh multipolar distributioni.e., the radiation is synchrotronic. However, small black holes exhibit a totally different behavior: in the small black hole regim...
متن کاملSolar system effects in Schwarzschild–de Sitter spacetime
The Schwarzschild–de Sitter space–time describes the gravitational field of a spherically symmetric mass in a universe with cosmological constant Λ. Based on this space–time we calculate Solar system effects like gravitational redshift, light deflection, gravitational time delay, Perihelion shift, geodetic or de Sitter precession, as well as the influence of Λ on a Doppler measurement, used to ...
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ژورنال
عنوان ژورنال: Revista Brasileira de Ensino de Física
سال: 2020
ISSN: 1806-9126,1806-1117
DOI: 10.1590/1806-9126-rbef-2019-0262