30 citations · 30 across the 1 of their papers we have counts for
12 papers
Induced Matter and Particle Motion in Non-Compact Kaluza-Klein Gravity
Andrew P. Billyard, William N. Sajko
We examine generalizations of the five-dimensional canonical metric by including a dependence of the extra coordinate in the four-dimensional metric. We discuss a more appropriate…
Cyclical Behaviour in Early Universe Cosmologies
Andrew P. Billyard, Alan A. Coley, James E. Lidsey
We study early universe cosmologies derived from a scalar-tensor action containing cosmological constant terms and massless fields. The governing equations can be written as a dyna…
Qualitative Analysis of Isotropic Curvature String Cosmologies
Andrew P. Billyard, Alan A. Coley, James E. Lidsey
A complete qualitative study of the dynamics of string cosmologies is presented for the class of isotopic curvature universes. These models are of Bianchi types I, V and IX and red…
The Asymptotic Behaviour of Cosmological Models Containing Matter and Scalar Fields
Andrew P. Billyard
The asymptotic behaviour of two classes of scalar field cosmological models are studied using the theory of dynamical systems: general relativistic Bianchi models containing matter…
Interactions in Scalar Field Cosmology
Andrew P. Billyard, Alan A. Coley
We investigate spatially flat isotropic cosmological models which contain a scalar field with an exponential potential and a perfect fluid with a linear equation of state. We inclu…
Dynamics of M-Theory Cosmology
Andrew P. Billyard, Alan A. Coley, James E. Lidsey +1
A complete global analysis of spatially-flat, four-dimensional cosmologies derived from the type IIA string and M-theory effective actions is presented. A non--trivial Ramond-Ramon…