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Topological Defects in Contracting Universes
P. P. Avelino, C. J. A. P. Martins, C. Santos +1
We study the behaviour and consequences of cosmic string networks in contracting universes. They approximately behave during the collapse phase as a radiation fluids. Scaling solut…
Causal perturbation theory in general FRW cosmologies II: superhorizon behaviour and initial conditions
G. Amery, E. P. S. Shellard
We describe how causality and energy-momentum conservation constrain the superhorizon behaviour of perturbation variables in a general FRW spacetime. The effect of intrinsic curvat…
Causal perturbation theory in general FRW cosmologies I: energy momentum conservation and matching conditions
G. Amery, E. P. S. Shellard
We describe energy--momentum conservation in relativistic perturbation theory in general FRW backgrounds with causal source terms, such as the presence of cosmic defect networks. W…
On the Behaviour and Stability of Superconducting Currents
Y. Lemperiere, E. P. S. Shellard
We present analytic and numerical results for the evolution of currents on superconducting strings in the classical model. We derive an energy functional for the…
Topological defects: A problem for cyclic universes?
P. P. Avelino, C. J. A. P. Martins, C. Santos +1
We study the behaviour of cosmic string networks in contracting universes, and discuss some of their possible consequences. We note that there is a fundamental time asymmetry betwe…