John W. Moffat

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A covariant scalar-tensor-vector gravity theory is developed which allows the gravitational constant G, a vector field coupling ω and the vector field mass µ to vary with space and time. The equations of motion for a test particle lead to a modified gravitational acceleration law that can fit galaxy rotation curves and cluster data without non-baryonic dark(More)
A dynamical model for varying light velocity in cosmology is developed , based on the idea that there are two metrics in spacetime. One metric g µν describes the standard gravitational vacuum, and the otherˆg µν = g µν + βψ µ ψ ν describes the geometry through which matter fields propagate. Matter propagating causally with respect tô g µν can provide(More)
The field equations in the nonsymmetric gravitational theory are derived from a Lagrangian density using a first-order formalism. Using the general covariance of the Lagrangian density, conservation laws and tensor identities are derived. Among these are the generalized Bianchi identities and the law of energy-momentum conservation. The Lagrangian density(More)
BACKGROUND National campaigns focusing on key symptoms of bowel and lung cancer ran in England in 2012, targeting men and women over the age of 50 years, from lower socioeconomic groups. METHODS Data from awareness surveys undertaken with samples of the target audience (n=1245/1140 pre-/post-bowel campaign and n=1412/1246 pre-/post-lung campaign) and(More)
Two variable speed of light models and their physical consequences are investigated. It is ten years ago that an alternative solution to the initial value problems of cosmology based on a variable speed of light (VSL) was published [1]. The model was based on the idea that in the very early universe at a time t ∼ t P ∼ 10 −43 sec., where t P denotes the(More)
The gravitational wave solutions obtained from a perturbation about confor-mally flat backgrounds in Einstein gravity are investigated. A perturbation theory analysis of the Lesame, Ellis and Dunsby results, based on a covari-ant approach, shows that for gravitational waves interacting with irrotational dust, the equations are linearization unstable. The(More)
A new version of nonsymmetric gravitational theory is presented. The field equations are expanded about the Minkowski metric, giving in lowest order the linear Einstein field equations and massive Proca field equations for the antisymmetric field g [µν]. An expansion about an arbitrary Einstein background metric yields massive Proca field equations with(More)
The spontaneous breaking of local Lorentz invariance in the early Universe, associated with a first order phase transition at a critical time t c , generates a large increase in the speed of light and a superluminary communication of information occurs, allowing all regions in the Universe to be causally connected. This solves the horizon problem, leads to(More)