128 citations · 875 across the 38 of their papers we have counts for
5 papers · 1 filter
Kinematic and Weyl singularities
W. C. Lim, A. A. Coley, S. Hervik
We study the properties of a future singularity encountered by a perfect fluid observer in tilting spatially homogeneous Bianchi cosmologies. We derive the boost formulae for the W…
Averaging in Spherically Symmetric Cosmology
A. A. Coley, N. Pelavas
In the macroscopic gravity approach to the averaging problem in cosmology, the Einstein field equations on cosmological scales are modified by appropriate gravitational correlation…
Averaging Spherically Symmetric Spacetimes in General Relativity
A. A. Coley, N. Pelavas
We discuss the averaging problem in general relativity, using the form of the macroscopic gravity equations in the case of spherical symmetry in volume preserving coordinates. In p…
Fluid observers and tilting cosmology
A. A. Coley, S. Hervik, W. C. Lim
We study perfect fluid cosmological models with a constant equation of state parameter in which there are two naturally defined time-like congruences, a geometrically defined g…
Cosmology: a bird's eye view
Alan A. Coley, Sigbjorn Hervik, Woei Chet Lim
In this essay we discuss the difference in views of the Universe as seen by two different observers. While one of the observers follows a geodesic congruence defined by the geometr…