26 citations · 46 across the 5 of their papers we have counts for
5 papers
Classical and Quantum Analysis of Repulsive Singularities in Four Dimensional Extended Supergravity
I. Gaida, H. R. Hollmann, J. M. Stewart
Non--minimal repulsive singularities (``repulsons'') in extended supergravity theories are investigated. The short distance antigravity properties of the repulsons are tested at th…
't Hooft's Polygon Approach Hyperbolically Revisited
Helia R. Hollmann, Ruth M. Williams
The initial data in the polygon approach to (2+1)D gravity coupled to point particles are constrained by the vertex equations and the particle equations. We establish the hyperboli…
A Harmonic Space Approach to Spherically Symmetric Quantum Gravity
Helia Hollmann
After dimensional reduction the stationary spherically symmetric sector of Einstein's gravity is identified with an SL(2,R)/SO(2) Sigma model coupled to a one dimensional gravitati…
Group Theoretical Quantization of Schwarzschild and Taub-NUT
Helia Hollmann
Stationary spherically symmetric gravity is equivalent to a nonlinear coset sigma model on SL(2,R)/SO(2) coupled to a gravitational remnant. Classically there are stationary soluti…
On the Stability of Gravitating Nonabelian Monopoles
Helia Hollmann
The behaviour of magnetic monopole solutions of the Einstein-Yang-Mills-Higgs equations subject to linear spherically symmetric perturbations is studied. Using Jacobi's criterion s…