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3,856
Abstract Cosmological Black Holes as Models of Cosmological Inhomogeneities
, 2006
"... Since cosmological black holes modify the density and pressure of the surrounding universe, and introduce heat conduction, they produce simple models of cosmological inhomogeneities that can be used to study the eect of inhomogeneities on the universe's expansion. In this thesis, new cosmologi ..."
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holes in asymptotically
at universes, and by performing a conformal transformation on isotropic black hole spacetimes to obtain isotropic cosmological black hole spacetimes. The latter approach is found to produce cosmological black holes with energymomentum tensors that are physical throughout
Quantum Gravity
, 2004
"... We describe the basic assumptions and key results of loop quantum gravity, which is a background independent approach to quantum gravity. The emphasis is on the basic physical principles and how one deduces predictions from them, at a level suitable for physicists in other areas such as string theor ..."
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Cited by 572 (11 self)
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integral quantizations, coupling to matter, extensions to supergravity and higher dimensional theories, as well as applications to black holes, cosmology and Plank scale phenomenology. We describe the near term prospects for observational tests of quantum theories of gravity and the expectations that loop
Breaking an Abelian gauge symmetry near a black hole horizon
, 2008
"... I argue that coupling the Abelian Higgs model to gravity plus a negative cosmological constant leads to black holes which spontaneously break the gauge invariance via a charged scalar condensate slightly outside their horizon. This suggests that black holes can superconduct. ..."
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Cited by 274 (8 self)
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I argue that coupling the Abelian Higgs model to gravity plus a negative cosmological constant leads to black holes which spontaneously break the gauge invariance via a charged scalar condensate slightly outside their horizon. This suggests that black holes can superconduct.
Cosmological and black hole spacetimes in twisted noncommutative gravity
 arXiv:0906.2730. A. Schenkel and C.F. Uhlemann
"... Abstract: We derive noncommutative Einstein equations for abelian twists and their solutions in consistently symmetry reduced sectors, corresponding to twisted FRW cosmology and Schwarzschild black holes. While some of these solutions must be rejected as models for physical spacetimes because they c ..."
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Cited by 6 (0 self)
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Abstract: We derive noncommutative Einstein equations for abelian twists and their solutions in consistently symmetry reduced sectors, corresponding to twisted FRW cosmology and Schwarzschild black holes. While some of these solutions must be rejected as models for physical spacetimes because
ON THE BLACK HOLE INTERIOR SPACETIME
, 2008
"... A new version of the geometry inside a black hole is proposed, on the grounds of an idea given by Doran et al. The spacetime is still time dependent and is a solution of Einstein’s equations with a stress tensor corresponding to an anisotropic fluid. The model leads to a timedependent cosmological ..."
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A new version of the geometry inside a black hole is proposed, on the grounds of an idea given by Doran et al. The spacetime is still time dependent and is a solution of Einstein’s equations with a stress tensor corresponding to an anisotropic fluid. The model leads to a timedependent cosmological
Cosmological Black Holes
, 2001
"... In this letter we propose the existence of low density black holes and discuss its compatibility with the cosmological observations. The origin of these black holes can be traced back to the collapse of long wavelength cosmological perturbations during the matter dominated era, when the densities ar ..."
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In this letter we propose the existence of low density black holes and discuss its compatibility with the cosmological observations. The origin of these black holes can be traced back to the collapse of long wavelength cosmological perturbations during the matter dominated era, when the densities
Thermodynamics Of Black Holes
 In Antide Sitter
, 1983
"... One would expect spacetime to have a foamlike structure on the Planck scale with a very high topology. If spacetime is simply connected (which is assumed in this paper), the nontrivial homology occurs in dimension two, and spacetime can be regarded as being essentially the topological sum of S 2 × ..."
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Cited by 149 (0 self)
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× S 2 and K3 bubbles. Comparison with the instantons for pair creation of black holes shows that the S 2 × S 2 bubbles can be interpreted as closed loops of virtual black holes. It is shown that scattering in such topological fluctuations leads to loss of quantum coherence, or in other words, to a
1 BLACK HOLES ON COSMOLOGICAL BRANES ∗
, 2007
"... While in general relativity black holes can be freely embedded into a cosmological background, the same problem in braneworlds is much more cumbersome. We present here the results obtained so far in the explicit constructions of such spacetimes. We also discuss gravitational collapse in this conte ..."
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While in general relativity black holes can be freely embedded into a cosmological background, the same problem in braneworlds is much more cumbersome. We present here the results obtained so far in the explicit constructions of such spacetimes. We also discuss gravitational collapse
Cosmological And Black Hole Horizon Fluctuations
, 1997
"... The quantum fluctuations of horizons in RobertsonWalker universes and in the Schwarzschild spacetime are discussed. The source of the metric fluctuations is taken to be quantum linear perturbations of the gravitational field. Lightcone fluctuations arise when the retarded Green's function f ..."
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Cited by 6 (0 self)
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geodesic observer falling through the horizon. In the case of an expanding universe, this is a comoving observer either entering or leaving the horizon of another observer. In the black hole case, we take this observer to be one who falls freely from rest at infinity. We find that cosmological horizon
Cosmological MultiBlack Hole Solutions ⋆
, 1992
"... We present simple, analytic solutions to the EinsteinMaxwell equation, which describe an arbitrary number of charged black holes in a spacetime with positive cosmological constant Λ. In the limit Λ = 0, these solutions reduce to the well known MajumdarPapapetrou (MP) solutions. Like the MP solutio ..."
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Cited by 1 (0 self)
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We present simple, analytic solutions to the EinsteinMaxwell equation, which describe an arbitrary number of charged black holes in a spacetime with positive cosmological constant Λ. In the limit Λ = 0, these solutions reduce to the well known MajumdarPapapetrou (MP) solutions. Like the MP
Results 1  10
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3,856