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The isotropic blackbody CMB as evidence for a homogeneous universe
Timothy Clifton, Chris Clarkson, Philip Bull
The question of whether the Universe is spatially homogeneous and isotropic on the largest scales is of fundamental importance to cosmology, but has not yet been answered decisivel…
Observational Constraints on the Averaged Universe
Chris Clarkson, Timothy Clifton, Alan Coley +1
Averaging in general relativity is a complicated operation, due to the general covariance of the theory and the non-linearity of Einstein's equations. The latter of these ensures t…
An Improved Treatment of Optics in the Lindquist-Wheeler Models
Timothy Clifton, Pedro G. Ferreira, Kane O'Donnell
We consider the optical properties of Lindquist-Wheeler (LW) models of the Universe. These models consist of lattices constructed from regularly arranged discrete masses. They are…
The kSZ effect as a test of general radial inhomogeneity in LTB cosmology
Philip Bull, Timothy Clifton, Pedro G. Ferreira
The apparent accelerating expansion of the Universe, determined from observations of distant supernovae, and often taken to imply the existence of dark energy, may alternatively be…
Modified Gravity and Cosmology
Timothy Clifton, Pedro G. Ferreira, Antonio Padilla +1
In this review we present a thoroughly comprehensive survey of recent work on modified theories of gravity and their cosmological consequences. Amongst other things, we cover Gener…