69 citations · 336 across the 22 of their papers we have counts for
12 papers · 1 filter
On Gravitational Chirality as the Genesis of Astrophysical Jets
Robin W. Tucker, Timothy J. Walton
It has been suggested that single and double jets observed emanating from certain astrophysical objects may have a purely gravitational origin. We discuss new classes of plane-fron…
Spinning particles in scalar-tensor gravity
D. A. Burton, R. W. Tucker, C. H. Wang
We develop a new model of a spinning particle in Brans-Dicke spacetime using a metric-compatible connection with torsion. The particle's spin vector is shown to be Fermi-parallel (…
Autoparallel orbits in Kerr Brans-Dicke spacetimes
H. Cebeci, T. Dereli, R. W. Tucker
The bounded orbital motion of a massive spinless test particle in the background of a Kerr Brans-Dicke geometry is analysed in terms of worldlines that are auto-parallels of differ…
Scattering of Spinning Test Particles by Plane Gravitational and Electromagnetic Waves
S Kessari, D Singh, R W Tucker +1
The Mathisson-Papapetrou-Dixon (MPD) equations for the motion of electrically neutral massive spinning particles are analysed, in the pole-dipole approximation, in an Einstein-Maxw…
On the Motion of Matter in Spacetime
T. Dereli, R. W. Tucker
We argue that the geodesic hypothesis based on auto-parallels of the Levi-Civita connection may need refinement in theories of gravity with additional scalar fields. This argument…
On the Detection of Scalar Field Induced Spacetime Torsion
T. Dereli, R. W. Tucker
We argue that the geodesic hypothesis based on the autoparalllels of the Levi-Civita connection may need refinement in the scalar- tensor theories of gravity. Based on a reformulat…
Self-gravitating line sources of weak hypercharge
T. Dereli, R. W. Tucker
We explore the role of the Cremmer-Scherk mechanism in the context of low energy effective string theory by coupling the antisymmetric 3-form gauge potential to an Abelian gauge po…
Dark Matter Gravitational Interactions
R. W. Tucker, C. Wang
We argue that the conjectured dark mater in the Universe may be endowed with a new kind of gravitational charge that couples to a short range gravitational interaction mediated by…
The Construction of Spinor Fields on Manifolds with Smooth Degenerate Metrics
J Schray, T Dray, C A Manogue +2
We examine some of the subtleties inherent in formulating a theory of spinors on a manifold with a smooth degenerate metric. We concentrate on the case where the metric is singular…
Non-Riemannian Gravity and the Einstein-Proca System
T Dereli, M Önder, J Schray +2
We argue that all Einstein-Maxwell or Einstein-Proca solutions to general relativity may be used to construct a large class of solutions (involving torsion and non-metricity) to th…
On the Relation between Classical and Quantum Cosmology in a 2-Dimensional Dilaton-Gravity Model
M Onder, R W Tucker
We analyse the classical and quantum theory of a scalar field interacting with gravitation in two dimensions. We describe a class of analytic solutions to the Wheeler-DeWitt equati…
The Scalar Field Equation in the Presence of Signature Change
Tevian Dray, Corinne A. Manogue, Robin W. Tucker
We consider the (massless) scalar field on a 2-dimensional manifold with metric that changes signature from Lorentzian to Euclidean. Requiring a conserved momentum in the spatially…