565 citations · 5.9k across the 83 of their papers we have counts for
14 papers · 1 filter
Positive Energy Functional for Massless Scalars in Rotating Black Hole Backgrounds of Maximal Ungauged Supergravity
M. Cvetic, G. W. Gibbons, C. N. Pope +1
We outline a proof of the stability of a massless neutral scalar field in the background of a wide class of four dimensional asymptotically flat rotating and ``electrically cha…
Cosmological aspects of the Eisenhart-Duval lift
M. Cariglia, A. Galajinsky, G. W. Gibbons +1
A cosmological extension of the Eisenhart-Duval metric is constructed by incorporating a cosmic scale factor and the energy-momentum tensor into the scheme. The dynamics of the spa…
STU Black Holes and SgrA*
M. Cvetic, G. W. Gibbons, C. N. Pope
The equations of null geodesics in the STU family of rotating black hole solutions of supergravity theory, which may be considered as deformations of the vacuum Kerr metric, are co…
Photon Spheres and Sonic Horizons in Black Holes from Supergravity and Other Theories
M. Cvetic, G. W. Gibbons, C. N. Pope
We study closed photon orbits in spherically-symmetric static solutions of supergravity theories, a Horndeski theory, and a theory of quintessence. These orbits lie in what we shal…
The fate of Hamilton's Hodograph in Special and General Relativity
G. W. Gibbons
The hodograph of a non-relativistic particle motion in Euclidean space is the curve described by its momentum vector. For a general central orbit problem the hodograph is the inver…
The Jacobi-metric for timelike geodesics in static spacetimes
G. W. Gibbons
It is shown that the free motion of massive particles moving in static spacetimes are given by the geodesics of an energy-dependent Riemannian metric on the spatial sections analog…
Conformal Carroll groups and BMS symmetry
C. Duval, G. W. Gibbons, P. A. Horvathy
The Bondi-Metzner-Sachs (BMS) group is shown to be the conformal extension of Levy-Leblond's "Carroll" group. Further extension to the Newman-Unti (NU) group is also discussed in t…
Topology change in classical and quantum gravity
G. W. Gibbons
In these two lectures I describe the difficulties one encounters when trying to construct a framework in which to describe topology change in classical general relativity where one…
Selfgravitating magnetic monopoles, global monopoles and black holes
G. W. Gibbons
Lectures on self-gravitating black holes and monopoles given at a Summer School in Lisbon in 1990 which contain material still of relevance.
Traffic Noise and the Hyperbolic Plane
G. W. Gibbons, C. M. Warnick
We consider the problem of sound propagation in a wind. We note that the rays, as in the absence of a wind, are given by Fermat's principle and show how to map them to the trajecto…
Global embedding of the Kerr black hole event horizon into hyperbolic 3-space
G. W. Gibbons, C. A. R. Herdeiro, C. Rebelo
An explicit global and unique isometric embedding into hyperbolic 3-space, H^3, of an axi-symmetric 2-surface with Gaussian curvature bounded below is given. In particular, this al…
Master Equations and Majorana Spinors
G W Gibbons
I describe how the states of a discrete automata with p sites, each of which may be off or on, can be represented as Majorana spinors associated to a spacetime with signature (p,p)…
A Judgement on Sinors
Andrew Chamblin, G. W. Gibbons
This note contains some comments on a recent paper by Friedman on two-component spinors in spacetimes which do not admit a time-orientation, and is intended to clarify the relation…
Anomalous Fermion Production in Gravitational Collapse
G. W. Gibbons, Alan R. Steif
The Dirac equation is solved in the Einstein-Yang-Mills background found by Bartnik and McKinnon. We find a normalizable zero-energy fermion mode in the -wave sector. As shown r…