33 citations · 125 across the 14 of their papers we have counts for
14 papers
Periodic boundary conditions and cosmology
Alan Coley, Woei Chet Lim
In the standard concordance cosmology the spatial curvature is assumed to be constant and zero (or at least very small). In particular, in numerical computations of the structure o…
Numerical confirmations of joint spike transitions in cosmologies
Woei Chet Lim
We produce numerical evidence that the joint spike transitions between Kasner eras of cosmologies are described by the non-orthogonally transitive spike solution. A new…
Transition analysis of the non-OT stiff fluid spike solution
Woei Chet Lim, Muhammad Zubair Ali Moughal
We use the technique developed in Moughal's doctoral thesis to analyse the joint spike transition, revealing new groups of worldlines which undergo distinct transitions, and correc…
Cylindrical spikes
Muhammad Zubair Ali Moughal, Woei Chet Lim
The Geroch/Stephani transformation is a solution-generating transformation, and may generate spiky solutions. The spikes in solutions generated so far are either early-time permane…
Stiff fluid spike solutions from Bianchi type V seed solutions
Daniele Gregoris, Woei Chet Lim, Alan Coley
In this paper we expand upon our previous work [1] by using the entire family of Bianchi type V stiff fluid solutions as seed solutions of the Stephani transformation. Among the ne…
On the first stiff fluid spike solution in General Relativity
Alan Coley, Daniele Gregoris, Woei Chet Lim
Using the Geroch transformation we obtain the first example of an exact stiff fluid spike solution to the Einstein field equations in a closed form exhibiting a spacelike gro…
Spikes and matter inhomogeneities in massless scalar field models
Alan Coley, Woei Chet Lim
We shall discuss the general relativistic generation of spikes in a massless scalar field or stiff perfect fluid model. We first investigate orthogonally transitive (OT) stif…
Demonstration of the spike phenomenon using the LTB models
Alan Coley, Woei Chet Lim
We demonstrate the occurrence of permanent spikes using the Lemaitre-Tolman-Bondi models, chosen because the solutions are exact and can be analyzed by qualitative dynamical system…
General relativistic density perturbations
Woei Chet Lim, Alan Coley
We investigate a general relativistic mechanism in which spikes generate matter overdensities in the early universe. When the cosmological fluid is tilted, the tilt provides anothe…
Generating matter inhomogeneities in general relativity
Alan Coley, Woei Chet Lim
In this Letter we discuss a natural general relativistic mechanism that causes inhomogeneities and hence generates matter perturbations in the early universe. We concentrate on spi…
Tilted Bianchi VII_0 cosmologies -- the radiation bifurcation
W. C. Lim, R. J. Deeley, J. Wainwright
We derive the late-time behaviour of tilted Bianchi VII_0 cosmologies with an irrotational radiation fluid as source, and give the asymptotic form of the general solution as $t \to…
Tilt and phantom cosmology
A. A. Coley, S. Hervik, W. C. Lim
We show that in tilting perfect fluid cosmological models with an ultra-radiative equation of state, generically the tilt becomes extreme at late times and, as the tilt instability…
The Futures of Bianchi type VII0 cosmologies with vorticity
S. Hervik, R. J. van den Hoogen, W. C. Lim +1
We use expansion-normalised variables to investigate the Bianchi type VII model with a tilted -law perfect fluid. We emphasize the late-time asymptotic dynamical behaviour o…
Asymptotic analysis of spatially inhomogeneous stiff and ultra-stiff cosmologies
A. A. Coley, W. C. Lim
This article has been removed. It has been superseded by gr-qc/0506097.