A Fully Covariant Description of CMB Anisotropies (2007)
. Starting from the exact non - linear description of matter and radiation, a fully covariant and gauge - invariant formula for the observed temperature anisotropy of the cosmic microwave background...
Gravitational waves generated by second order effects during inflation (2006)
Osano, Bob, Pitrou, Cyril, Dunsby, Peter, Uzan, Jean-Philippe, Clarkson, Chris
The generation of gravitational waves during inflation due to the non-linear coupling of scalar and tensor modes is discussed. Two methods describing gravitational wave perturbations are used and...
Primordial magnetic seed field amplification by gravitational waves (2005)
Betschart, Gerold, Zunckel, Caroline, Dunsby, Peter, Marklund, Mattias
Using second-order gauge-invariant perturbation theory, a self-consistent framework describing the non-linear coupling between gravitational waves and a large-scale homogeneous magnetic field is...
Braneworld Dynamics of Inflationary Cosmologies with Exponential Potentials (2002)
Goheer, Naureen, Dunsby, Peter
In this work we consider Randall-Sundrum braneworld type scenarios, in which the spacetime is described by a five-dimensional manifold with matter fields confined in a domain wall or three-brane. We...
(1+3) Covariant Dynamics of Scalar Perturbations in Braneworlds (2001)
Leong, Bernard, Dunsby, Peter, Challinor, Anthony, Lasenby, Anthony
We discuss the dynamics of linear, scalar perturbations in an almost Friedmann-Robertson-Walker braneworld cosmology of Randall-Sundrum type II using the 1+3 covariant approach. We derive a complete...
Plane fronted parallel waves in a warm two-component plasma (2001)
Brodin, Gert, Marklund, Mattias, Dunsby, Peter
A general system of equations is derived, using the 1+3 orthonormal tetrad formalism, describing the influence of a plane-fronted-parallel gravitational wave on a warm relativistic two-component...
Bounce behaviour in Kantowski-Sachs and Bianchi Cosmologies (2001)
Solomons, Deon, Dunsby, Peter, Ellis, George
Many cosmological scenarios envisage either a bounce of the universe at early times, or collapse of matter locally to form a black hole which re-expands into a new expanding universe region. Energy...
Exact Inflation Braneworlds (2001)
Solomons, Deon, Dunsby, Peter, Ellis, George
In Randall-Sundrum type braneworld cosmologies, the dynamical equations on the three-brane differ from the general relativity equations by terms that carry the effects of embedding and of the free...
Radio wave emissions due to gravitational radiation (1999)
Marklund, Mattias, Brodin, Gert, Dunsby, Peter
We consider the interaction of a weak gravitational wave with electromagnetic fields in a thin plasma on a Minkowski background spacetime using the 1+3 orthonormal frame formalism. Because...
Gebbie, Tim, Dunsby, Peter, Ellis, George
This is the second of a series of papers extending the 1+3 covariant and gauge invariant treatment of kinetic theory to an examination of Cosmic Microwave Background temperature anisotropies arising...
Covariant Analysis of Gravitational Waves in a Cosmological Context (1998)
Dunsby, Peter, Bassett, Bruce, Ellis, George
The propagation of gravitational waves or tensor perturbations in a perturbed Friedmann-Robertson-Walker universe filled with a perfect fluid is re-examined. It is shown that while the shear and...
Conserved Quantities in Perturbed Inflationary Universes (1994)
Given that observations seem to favour a \index{density parameter} $\Omega_0
Constraints on Inflationary Solutions in the Presence of Shear and Bulk Viscosity (1994)
Van Elst, Henk, Dunsby, Peter, Tavakol, Reza
Inflationary models and their claim to solve many of the outstanding problems in cosmology have been the subject of a great deal of debate over the last few years. A major sticking point has been the...