G. W. Gibbons
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View article: Static Black Binaries in de Sitter Space
Static Black Binaries in de Sitter Space Open
We construct the first four-dimensional multiple black hole solution of general relativity with a positive cosmological constant. The solution consists of two static black holes whose gravitational attraction is balanced by the cosmic expa…
View article: Static Black Binaries in de Sitter
Static Black Binaries in de Sitter Open
We construct the first four-dimensional multi-black hole solution of general relativity with a positive cosmological constant. The solution consists of two static black holes whose gravitational attraction is balanced by the cosmic expansi…
View article: Supergravity black holes, Love numbers, and harmonic coordinates
Supergravity black holes, Love numbers, and harmonic coordinates Open
A problem which has now come to a head in general relativity, primarily as a result of the many recent detections of gravitational waves from the coalescence of compact binaries, is that there are very few viable theories against which to …
View article: Chronic wounds: Treatment consensus
Chronic wounds: Treatment consensus Open
The Wound Healing Foundation (WHF) recognised a need for an unbiased consensus on the best treatment of chronic wounds. A panel of 13 experts were invited to a virtual meeting which took place on 27 March 2021. The proceedings were organis…
View article: The impact of the <scp>SARS‐CoV</scp>‐2 pandemic on the management of chronic limb‐threatening ischemia and wound care
The impact of the <span>SARS‐CoV</span>‐2 pandemic on the management of chronic limb‐threatening ischemia and wound care Open
In the wake of the coronavirus pandemic, the critical limb ischemia (CLI) Global Society aims to develop improved clinical guidance that will inform better care standards to reduce tissue loss and amputations during and following the new S…
View article: Geodesic motion in Bogoslovsky-Finsler spacetimes
Geodesic motion in Bogoslovsky-Finsler spacetimes Open
International audience
View article: Positive Energy Functional for Massless Scalars in Rotating Black Hole Backgrounds of Maximal Ungauged Supergravity
Positive Energy Functional for Massless Scalars in Rotating Black Hole Backgrounds of Maximal Ungauged Supergravity Open
We outline a proof of the stability of a massless neutral scalar field ψ in the background of a wide class of four dimensional asymptotically flat rotating and "electrically charged" solutions of supergravity, and the low energy limit of s…
View article: Lifting the Eisenhart-Duval Lift to a Minimal Brane
Lifting the Eisenhart-Duval Lift to a Minimal Brane Open
The motion of a dynamical system on an $n$-dimensional configuration space may be regarded as the lightlike shadow of null geodsics moving in an $(n+2)$ dimensional spacetime known as its Einsenhart-Duval lift. In this paper it is shown th…
View article: An Audit of Utility and Cost of Temporal Artery Biopsy in a Regional Centre
An Audit of Utility and Cost of Temporal Artery Biopsy in a Regional Centre Open
Background: Giant Cell Arteritis (GCA) is a common chronic idiopathic vasculitis of medium to large vessels that can cause permanent visual loss and stroke.Temporal Artery Biopsy (TAB) is the gold standard diagnostic test with specificity …
View article: Higher derivative scalar quantum field theory in curved spacetime
Higher derivative scalar quantum field theory in curved spacetime Open
We study a free scalar field $\\phi$ in a fixed curved background spacetime\nsubject to a higher derivative field equation of the form $F(\\Box)\\phi =0$,\nwhere $F$ is a polynomial of the form $F(\\Box)= \\prod_i (\\Box-m_i^2)$ and all\nm…
View article: The Gravitational Magnetoelectric Effect
The Gravitational Magnetoelectric Effect Open
Electromagnetism in spacetime can be treated in terms of an analogue linear dielectric medium. In this paper, we discuss the gravitational analogue of the linear magnetoelectric effect, which can be found in multiferroic materials. While t…
View article: Solitons and Black Holes in 4 and 5 Dimensions
Solitons and Black Holes in 4 and 5 Dimensions Open
Two lectures given in Paris in 1985. They were circulated as a preprint Solitons And Black Holes In Four-Dimensions, Five-Dimensions. G.W. Gibbons (Cambridge U.) . PRINT-85-0958 (CAMBRIDGE), (Received Dec 1985). 14pp. and appeared in print…
View article: The Ashtekar-Hansen universal structure at spatial infinity is weakly pseudo-Carrollian
The Ashtekar-Hansen universal structure at spatial infinity is weakly pseudo-Carrollian Open
It is shown that Ashtekar and Hansens's Universal Structure at Spatial Infinity (SPI), which has recently be used to establish the conservation of supercharges from past null infity to future null infinity, is an example of a (pseudo-) Car…
View article: Killing horizons: Negative temperatures and entropy super-additivity
Killing horizons: Negative temperatures and entropy super-additivity Open
Many discussions in the literature of spacetimes with more than one Killing\nhorizon note that some horizons have positive and some have negative surface\ngravities, but assign to all a positive temperature. However, the first law of\nther…
View article: Erratum: Ion traps and the memory effect for periodic gravitational waves [Phys. Rev. D <b>98</b>, 044037 (2018)]
Erratum: Ion traps and the memory effect for periodic gravitational waves [Phys. Rev. D <b>98</b>, 044037 (2018)] Open
Received 3 October 2018DOI:https://doi.org/10.1103/PhysRevD.98.089901© 2018 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasAtom & ion trapping & guidingGravitational wavesGravitation, Cosmology & AstrophysicsCondens…
View article: Ion traps and the memory effect for periodic gravitational waves
Ion traps and the memory effect for periodic gravitational waves Open
International audience
View article: Small & Big (and in between): Ion Traps and Gravitational Waves
Small & Big (and in between): Ion Traps and Gravitational Waves Open
The Eisenhart lift of a Paul Trap used to store ions in molecular physics is a linearly polarized periodic gravitational wave. A modified version of Dehmelt's Penning Trap is in turn related to circularly polarized periodic gravitational w…
View article: Lévy-Leblond fermions on the wormhole
Lévy-Leblond fermions on the wormhole Open
We propose a simple model of entanglement generated by geometry, studying non-relativistic massive Lévy-Leblond fermions in the $1+2$ geometry of a Bronnikov-Ellis wormhole. The model is equivalent to that of relativistic massless Dirac fe…
View article: Comparative effectiveness of a bilayered living cellular construct and an acellular fetal bovine collagen dressing in the treatment of venous leg ulcers
Comparative effectiveness of a bilayered living cellular construct and an acellular fetal bovine collagen dressing in the treatment of venous leg ulcers Open
Aim: To compare the effectiveness of bilayered living cellular construct (BLCC) and an acellular fetal bovine collagen dressing (FBCD) for the treatment of venous leg ulcers. Methods: Data from WoundExpert ® (Net Health, PA, USA) was used …
View article: Velocity Memory Effect for polarized gravitational waves
Velocity Memory Effect for polarized gravitational waves Open
Circularly polarized gravitational sandwich waves exhibit, as do their\nlinearly polarized counterparts, the Velocity Memory Effect: freely falling\ntest particles in the flat after-zone fly apart along straight lines with\nconstant veloci…
View article: Soft gravitons and the memory effect for plane gravitational waves
Soft gravitons and the memory effect for plane gravitational waves Open
The "gravitational memory effect" due to an exact plane wave provides us with\nan elementary description of the diffeomorphisms associated with soft\ngravitons. It is explained how the presence of the latter may be detected by\nobserving t…
View article: STU black holes and SgrA<sup>⋆</sup>
STU black holes and SgrA<sup>⋆</sup> Open
The equations of null geodesics in the STU family of rotating black hole\nsolutions of supergravity theory, which may be considered as deformations of\nthe vacuum Kerr metric, are completely integrable. We propose that they be used\nas a f…
View article: A Spacetime Geometry picture of Forest Fire Spreading and of Quantum Navigation
A Spacetime Geometry picture of Forest Fire Spreading and of Quantum Navigation Open
The problem of finding null geodesics in a stationary Lorentzian spacetime is known to to be equivalent to finding the geodsics of a Randers-Finlser structure. This latter problem is equivalent to finding the motion of charged particles mo…
View article: Zero mass limit of Kerr spacetime is a wormhole
Zero mass limit of Kerr spacetime is a wormhole Open
We show that, contrary to what is usually claimed in the literature, the zero\nmass limit of Kerr spacetime is not flat Minkowski space but a spacetime whose\ngeometry is only locally flat. This limiting spacetime, as the Kerr spacetime\ni…
View article: Jacobi–Maupertuis metric and Kepler equation
Jacobi–Maupertuis metric and Kepler equation Open
This paper studies the application of the Jacobi–Eisenhart lift, Jacobi metric and Maupertuis transformation to the Kepler system. We start by reviewing fundamentals and the Jacobi metric. Then we study various ways to apply the lift to Ke…
View article: Maximum magnetic moment to angular momentum conjecture
Maximum magnetic moment to angular momentum conjecture Open
Conjectures play a central role in theoretical physics, especially those that assert an upper bound to some dimensionless ratio of physical quantities. In this paper we introduce a new such conjecture bounding the ratio of the magnetic mom…
View article: Jacobi-Maupertuis-Eisenhart metric and geodesic flows
Jacobi-Maupertuis-Eisenhart metric and geodesic flows Open
The Jacobi metric derived from the line element by one of the authors is shown to reduce to the standard formulation in the non-relativistic approximation. We obtain the Jacobi metric for various stationary metrics. Finally, the Jacobi-Mau…