Entropic Priors and Bayesian Model Selection (2009)
Brewer, Brendon J., Francis, Matthew J.
We demonstrate that the principle of maximum relative entropy (ME), used judiciously, can ease the specification of priors in model selection problems. The resulting effect is that models that make...
Fractal Bubble Cosmology: A concordant cosmological model? (2009)
Kwan, Juliana, Francis, Matthew J., Lewis, Geraint F.
The Fractal Bubble model has been proposed as a viable cosmology that does not require dark energy to account for cosmic acceleration, but rather attributes its observational signature to the...
Halo Mass Functions in Early Dark Energy Cosmologies (2008)
Francis, Matthew J., Lewis, Geraint F., Linder, Eric V.
We examine the linear density contrast at collapse time, $\delta_c$ for large-scale structure in dynamical dark energy cosmologies, including models with early dark energy. Contrary to previous...
Can Early Dark Energy be Detected in Non-Linear Structure? (2008)
Francis, Matthew J., Lewis, Geraint F., Linder, Eric V.
We present the first study of early dark energy cosmologies using N-body simulations to investigate the formation of non-linear structure. In contrast to expectations from semi-analytic approaches,...
Cosmological Radar Ranging in an Expanding Universe (2008)
Lewis, Geraint F., Francis, Matthew J., Barnes, Luke A., Kwan, Juliana, James, J. Berian
While modern cosmology, founded in the language of general relativity, is almost a century old, the meaning of the expansion of space is still being debated. In this paper, the question of radar...
Coordinate Confusion in Conformal Cosmology (2007)
Lewis, Geraint F., Francis, Matthew J., Barnes, Luke A., James, J. Berian
A straight-forward interpretation of standard Friedmann-Lemaitre-Robertson-Walker (FLRW) cosmologies is that objects move apart due to the expansion of space, and that sufficiently distant galaxies...
Expanding Space: the Root of all Evil? (2007)
Francis, Matthew J., Barnes, Luke A., James, J. Berian, Lewis, Geraint F.
While it remains the staple of virtually all cosmological teaching, the concept of expanding space in explaining the increasing separation of galaxies has recently come under fire as a dangerous idea...
Power Spectra to 1% Accuracy between Dynamical Dark Energy Cosmologies (2007)
Francis, Matthew J., Lewis, Geraint F., Linder, Eric V.
For dynamical dark energy cosmologies we carry out a series of N-body gravitational simulations, achieving percent level accuracy in the relative mass power spectra at any redshift. Such accuracy in...
Joining the Hubble Flow: Implications for Expanding Space (2006)
Barnes, Luke A., Francis, Matthew J., James, J. Berian, Lewis, Geraint F.
The concept of expanding space has come under fire recently as being inadequate and even misleading in describing the motion of test particles in the universe. Previous investigations have suffered...
The Influence of Evolving Dark Energy on Cosmology (2005)
Barnes, Luke, Francis, Matthew J., Lewis, Geraint F., Linder, Eric V.
Observational evidence indicating that the expansion of the universe is accelerating has surprised cosmologists in recent years. Cosmological models have sought to explain this acceleration by...