Difficulties Distinguishing Dark Energy from Modified Gravity via Redshift Distortions (2009)
Simpson, Fergus, Peacock, John A.
The bulk motion of galaxies induced by the growth of cosmic structure offers a rare opportunity to test the validity of general relativity across cosmological scales. However, modified gravity can be...
Redshift Sensitivity of the Kaiser Effect (2009)
We explore potential strategies for testing General Relativity via the coherent motions of galaxies. Our position at z=0 provides the reference point for distance measures in cosmology. By contrast,...
Locating the Baryon Acoustic Peak (2009)
Simpson, Fergus, Peacock, John A., Simon, Patrick
Forthcoming photometric redshift surveys should provide an accurate probe of the acoustic peak in the two-point galaxy correlation function, in the form of angular clustering of galaxies within a...
On lensing by a cosmological constant (2008)
Simpson, Fergus, Peacock, John A., Heavens, Alan F.
Several recent papers have suggested that the cosmological constant influences the gravitational deflection of light; we reach a different conclusion. We begin by recasting a linearly perturbed FRW...
An Alternative Approach to Holographic Dark Energy (2006)
Here we consider a scenario in which dark energy is associated with the apparent area of a surface in the early universe. In order to resemble the cosmological constant at late times, this...
The Redshift Sensitivities of Dark Energy Surveys (2006)
Simpson, Fergus, Bridle, Sarah
Great uncertainty surrounds dark energy, both in terms of its physics, and the choice of methods by which the problem should be addressed. Here we quantify the redshift sensitivities offered by...
Observing Baryon Oscillations with Cosmic Shear (2005)
A cosmic shear survey, spanning a significant proportion of the sky, should greatly improve constraints on a number of cosmological parameters. It also provides a unique opportunity to examine the...
Illuminating Dark Energy with Cosmic Shear (2004)
Simpson, Fergus, Bridle, Sarah
One of the principal goals of modern cosmology is to constrain the properties of dark energy. At present, numerous surveys are aiming to determine the equation of state, which is assumed constant due...