673 research outputs found
A generalisation of the Heckmann - Schucking cosmological solution
An exact solution of the Einstein equations for a Bianchi -I universe in the
presence of dust, stiff matter and cosmological constant, generalising the
well-known Heckmann-Schucking solution is presented. PACS: 04.20-q; 04.20.Dw
Keywords: Exact cosmological solutionsComment: LaTeX file, 10 pages. Physics Letters B, to appea
Black hole singularities: a new critical phenomenon
The singularitiy inside a spherical charged black hole, coupled to a
spherical, massless scalar field is studied numerically. The profile of the
characteristic scalar field was taken to be a power of advanced time with an
exponent . A critical exponent exists. For
exponents below the critical one () the singularity
is a union of spacelike and null sectors, as is also the case for data with
compact support. For exponents greater than the critical one
() an all-encompassing, spacelike singularity
evolves, which completely blocks the ``tunnel'' inside the black hole,
preventing the use of the black hole as a portal for hyperspace travel.Comment: 4 pages, 5 eps figures; An Erratum is added. The main conclusions of
the original Letter are unchange
Cosmological singularities and modified theories of gravity
We consider perturbative modifications of the Friedmann equations in terms of density corresponding to modified theories of gravity proposed as an alternative route to comply with the observed accelerated expansion of the universe. Assuming that the present matter content of the universe is a pressureless fluid, the possible singularities that may arise as the final state of the universe are surveyed. It is shown that, at most, two coefficients of the perturbative expansion of the Friedman equations are relevant for the analysis. Some examples of application of the perturbative scheme are included
Energy Distribution of a Charged Regular Black Hole
We calculate the energy distribution of a charged regular black hole by using
the energy-momentum complexes of Einstein and M{\o}ller.Comment: 6 pages, no figure
Non-Singular Charged Black Hole Solution for Non-Linear Source
A non-singular exact black hole solution in General Relativity is presented.
The source is a non-linear electromagnetic field, which reduces to the Maxwell
theory for weak field. The solution corresponds to a charged black hole with
|q| \leq 2s_c m \approx 0.6 m, having metric, curvature invariants, and
electric field bounded everywhere.Comment: 3 pages, RevTe
The BTZ black hole as a Lorentz-flat geometry
It is shown that 2+1 dimensional anti-de Sitter spacetimes are Lorentz-flat.
This means, in particular, that any simply-connected patch of the BTZ black
hole solution can be endowed with a Lorentz connection that is locally pure
gauge. The result can be naturally extended to a wider class of black hole
geometries and point particles in three-dimensional spacetime.Comment: 2 page
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