3,372 research outputs found
Reissner-Nordstr\"om Metric in the Friedman-Robertson-Walker Universe
The metric for a Reissner-Nordstrm black hole in the background of
the Friedman-Robertson-Walker universe is obtained. Then we verified it and
discussed the influence of the evolution of the universe on the size of the
black hole. To study the problem of the orbits of a planet in the expanding
universe, we rewrote the metric in the Schwarzschild coordinates system and
deduced the equation of motion for a planet.Comment: 8 pages, no figure
Dilaton Black Holes in de Sitter or Anti-de Sitter Universe
Poletti and Wiltshire have shown that, with the exception of a pure
cosmological constant, the solution of a dilaton black hole in the background
of de Sitter or anti-de Sitter universe, does not exist in the presence of one
Liouville-type dilaton potential. Here with the combination of three
Liouville-type dilaton potentials, we obtain the dilaton black hole solutions
in the background of de Sitter or anti-de Sitter universe.Comment: 13 pages,to appear in Phys. Rev.
Arbitrary Dimensional Schwarzschild-FRW Black Holes
The metric of arbitrary dimensional Schwarzschild black hole in the
background of Friedman-Robertson-Walker universe is presented in the cosmic
coordinates system. In particular, the arbitrary dimensional Schwarzschild-de
Sitter metric is rewritten in the Schwarzschild coordinates system and basing
on which the even more generalized higher dimensional Schwarzschild-de Sitter
metric with another extra dimensions is found. The generalized solution shows
that the cosmological constant may roots in the extra dimensions of space.Comment: 10 page
Higher Dimensional Dilaton Black Holes with Cosmological Constant
The metric of a higher-dimensional dilaton black hole in the presence of a
cosmological constant is constructed. It is found that the cosmological
constant is coupled to the dilaton in a non-trivial way. The dilaton potential
with respect to the cosmological constant consists of three Liouville-type
potentials.Comment: 8 pages,to appear in Phys. Lett.
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