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How Literal is the 1972 Translation Into English of J.L. Borges' Historia Universal de la Infamia?
Marcelo Sánchez
Jan 01, 2023
This article analyzes A Universal History of Infamy, the 1972 translation into English of Historia Universal de la Infamia (hereinafter, HUI). While assessing this translation's degree of literality, the authors also...
Maximum tension
JD Barrow, GW Gibbons
Feb 17, 2015
We discuss various examples and ramifications of the conjecture that there exists a maximum force (or tension) in general relativistic systems. We contrast this situation with that in Newtonian gravity, where no maximum force...
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The area of a rough black hole.
John D Barrow
Oct 12, 2020
We investigate the consequences for the black hole area of introducing fractal structure for the horizon geometry. We create a three-dimensional spherical analogue of a 'Koch Snowflake' using a infinite diminishing hierarchy of...
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"Photonic lantern" spectral filters in multi-core fibre
Fibre Bragg gratings are written across all 120 single-mode cores of a multi-core optical fibre. The fibre is interfaced to multimode ports by tapering it within a depressed-index glass jacket. The result is a compact multimode...
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The generic sudden singularity in Brans–Dicke theory
AbstractWe construct a formal asymptotic series expansion for a general solution of the Brans–Dicke equations with a fluid source near a sudden singularity. This solution contains 11 independent...
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The shape of bouncing universes
JD Barrow, C Ganguly
Jul 15, 2019
What happens to the most general closed oscillating universes in general relativity? We sketch the development of interest in cyclic universes from the early work of Friedmann and Tolman to modern variations introduced by the...
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Inflation without a trace of lambda
Abstract: We generalise Einstein’s formulation of the traceless Einstein equations to f(R) gravity theories. In the case of the vacuum traceless Einstein equations, we show that a non-constant Weyl tensor leads via a conformal...
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Cyclic Szekeres universes
Abstract: We consider the Szekeres universe with an inhomogeneous dust fluid and a homogeneous and isotropic ghost matter source with equation of state pg=(γ-1)ρg, where γ is a constant. The field equations determine two...
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Szekeres universes with homogeneous scalar fields.
We consider the existence of an "inflaton" described by an homogeneous scalar field in the Szekeres cosmological metric. The gravitational field equations are reduced to two families of solutions which describe the homogeneous...
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"Photonic lantern" spectral filters in multi-core fibre
Fibre Bragg gratings are written across all 120 single-mode cores of a multi-core optical fibre. The fibre is interfaced to multimode ports by tapering it within a depressed-index glass jacket. The result is a compact multimode...
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Einstein-aether theory in Weyl integrable geometry
Abstract: We study the Einstein-aether theory in Weyl integrable geometry. The scalar field which defines the Weyl affine connection is introduced in the gravitational field equation. We end up with an Einstein-aether scalar...
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Inhomogeneous spacetimes in Weyl integrable geometry with matter source
Abstract: We investigate the existence of inhomogeneous exact solutions in Weyl Integrable theory with a matter source. In particular, we consider the existence of a dust fluid source while for the underlying geometry we assume...
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