We investigate the potential of a future supernova data set, as might be obtained by the proposed SNAP satellite, to discriminate among different "dark energy" theories that describe an accelerating… (More)

Realizing controlled quantum dynamics via the magnetic interactions between colour centres in diamond remains a challenge despite recent demonstrations for nanometre separated pairs. Here we propose… (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 for… (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 ∼ `… (More)

One of the most challenging problems in modern cosmology is to provide an explanation for the recently observed accelerated expansion of the universe [1–3]. These observations have reopened the quest… (More)

Cosmology might turn out to be the study of fluctuations aroun d a “de Sitter equilibrium” state. In this article I review the basic ideas and the attrac tive features of this framework, and respond… (More)

I discuss the origin of the " Sakharov oscillations " (or " secondary Doppler peaks ") in standard angular power spectra of the Cosmic Microwave Background anisotropies calculated for inflationary… (More)

We investigate cosmic string models for structure formation which include a non-zero cosmological constant. We nd that the background evolution of density perturbations and modi cations to the… (More)

I show that the de Sitter equilibrium cosmology generically predicts observable levels of curvature in the Universe today. The predicted value of the curvature, Ω(k), depends only on the ratio of the… (More)

In the 15 years since Alan Guth’s famous paper[1] the idea of cosmic inflation has established itself as a central feature of modern cosmology. At this point the inflationary cosmologies are the only… (More)