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pro vyhledávání: '"Lim, Woei Chet"'
Autor:
Coley, Alan, Lim, Woei Chet
Publikováno v:
Class. Quantum Grav. 41 015009 (2024)
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 of the universe using N-body simulations, exact periodic boundary condi
Externí odkaz:
http://arxiv.org/abs/2312.03285
Autor:
Lim, Woei Chet
Publikováno v:
Class. Quantum Grav. 39 (2022) 065010
We produce numerical evidence that the joint spike transitions between Kasner eras of $G_2$ cosmologies are described by the non-orthogonally transitive $G_2$ spike solution. A new matching procedure is developed for this purpose.
Comment: 18 pa
Comment: 18 pa
Externí odkaz:
http://arxiv.org/abs/2202.02480
We consider a dynamical systems formulation for models with an exponential scalar field and matter with a linear equation of state in a spatially flat and isotropic spacetime. In contrast to earlier work, which only considered linear hyperbolic fixed
Externí odkaz:
http://arxiv.org/abs/2201.07596
Publikováno v:
Class. Quantum Grav. 39 (2022) 025010
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 correcting misconceptions about spikes.
Comment: 20 pages, 9 figures. A
Comment: 20 pages, 9 figures. A
Externí odkaz:
http://arxiv.org/abs/2111.15122
Publikováno v:
Class. Quantum Grav. 38 (2021) 075029
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 permanent spikes or transient spikes. We want to generate a solution with a l
Externí odkaz:
http://arxiv.org/abs/2102.12028
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 new exact solutions generated, we observe a number of important physical
Externí odkaz:
http://arxiv.org/abs/1705.02747
Publikováno v:
Class. Quantum Grav. 33 (2016) 215010
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 $G_1$ group of symmetries (i.e., with a single isometry). This new solution is
Externí odkaz:
http://arxiv.org/abs/1606.07177
Autor:
Coley, Alan, Lim, Woei Chet
Publikováno v:
Class. Quantum Grav. 33 (2016) 015009
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) $G_2$ stiff fluid spike models both heuristically and numerically, and give a ne
Externí odkaz:
http://arxiv.org/abs/1511.07095
Autor:
Lim, Woei Chet
Publikováno v:
Class. Quantum Grav. 32 (2015) 162001
We generalize the orthogonally transitive (OT) $G_2$ spike solution to the non-OT $G_2$ case. This is achieved by applying Geroch's transformation on a Kasner seed. The new solution contains two more parameters than the OT $G_2$ spike solution. Unlik
Externí odkaz:
http://arxiv.org/abs/1507.02754
Autor:
Lim, Woei Chet
In this thesis we investigate cosmological models more general than the isotropic and homogeneous Friedmann-Lemaître models. We focus on cosmologies with one spatial degree of freedom, whose matter content consists of a perfect fluid and the cosmolo
Externí odkaz:
http://hdl.handle.net/10012/1196