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- Constantinos Skordis, David Fonseca Mota, Pedro G. Ferreira, Ch BÃ¶hm
- Physical review letters
- 2006

A relativistic theory of modified gravity has been recently proposed by Bekenstein. The tensor field in Einstein's theory of gravity is replaced by a scalar, a vector, and a tensor field whichâ€¦ (More)

We examine the late-time (nucleosynthesis and later) cosmological implications of brane-world scenarios having large (millimeter sized) extra dimensions. In particular, recent proposals forâ€¦ (More)

- F. Bourliot, Pedro G. Ferreira, David Fonseca Mota, Constantinos Skordis
- 2006

F. Bourliot, P.G. Ferreira, D. F. Mota, 3, 4 and C. Skordis Astrophysics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH, UK 2 Institute for Theoretical Physics,â€¦ (More)

We show how the presence of a very light scalar with a cubic self-interaction in six dimensions can stabilize the extra dimensions at radii which are naturally exponentially large, r âˆ¼ `â€¦ (More)

The recent discovery of a Gunnâ€“Peterson (GP) trough in the spectrum of the redshift 6.28 SDSS quasar has raised the tantalizing possibility that we have detected the reionization of the universe.â€¦ (More)

Over the last few decades, astronomers and cosmologists have accumulated vast amounts of data clearly demonstrating that our current theories of fundamental particles and of gravity are inadequate toâ€¦ (More)

In a recent paper we considered the possibility of a scalar field providing an explanation for the cosmic acceleration. Our model had the interesting properties of attractor-like behavior and havingâ€¦ (More)

- Joanna Dunkley, Martin Bucher, Pedro G. Ferreira, Kavilan Moodley, Constantinos Skordis
- Physical review letters
- 2005

The cosmic microwave background (CMB) anisotropy constrains the geometry of the Universe because the positions of the acoustic peaks of the angular power spectrum depend strongly on the curvature ofâ€¦ (More)

- Arthur Avilez, Constantinos Skordis
- Physical review letters
- 2014

We report strong cosmological constraints on the Brans-Dicke (BD) theory of gravity using cosmic microwave background data from Planck. We consider two types of models. First, the initial conditionâ€¦ (More)

- Martin Bucher, Joanna Dunkley, Pedro G. Ferreira, Kavilan Moodley, Constantinos Skordis
- Physical review letters
- 2004

We investigate the constraints imposed by current data on correlated mixtures of adiabatic and nonadiabatic primordial perturbations. We discover subtle flat directions in parameter space thatâ€¦ (More)