827 citations · 16k across the 208 of their papers we have counts for
13 papers · 1 filter
Magnetohydrodynamics in the Early Universe and the Damping of Non-linear Alfven Waves
Kandaswamy Subramanian, John D. Barrow
The evolution and viscous damping of cosmic magnetic fields in the early universe, is analysed. Using the fact that the fluid, electromagnetic, and shear viscous energy-momentum te…
Limits on Cosmological Magnetic Fields and Other Anisotropic Stresses
John D. Barrow
We discuss the cosmological evolution of matter sources with small anisotropic pressures. This includes electric and magnetic fields, collisionless relativistic particles, graviton…
Varying G and Other Constants
John D. Barrow
We review recent progress in the study of varying constants and attempts to explain the observed values of the fundamental physical constants. We describe the variation of in N…
Is there chaos in string cosmology?
John D. Barrow, Mariusz P. Dabrowski
Bianchi type IX, 'Mixmaster' universes are investigated in low-energy-effective-action string cosmology. We show that, unlike in general relativity, there is no chaos in these stri…
Spherical Curvature Inhomogeneities in String Cosmology
John D. Barrow, Kerstin E. Kunze
We study the evolution of non-linear spherically symmetric inhomogeneities in string cosmology. Friedmann solutions of different spatial curvature are matched to produce solutions…
Limits on the Variability of Physical Constants
M. J. Drinkwater, J. K. Webb, J. D. Barrow +1
We have compared the frequency of high-redshift Hydrogen HI 21 cm absorption with that of associated molecular absorption in two quasars to place new (1 sigma) upper limits on any…
Chaos in the Einstein-Yang-Mills Equations
John D. Barrow, Janna Levin
Yang-Mills color fields evolve chaotically in an anisotropically expanding universe. The chaotic behaviour differs from that found in anisotropic Mixmaster universes. The universe…
Can Inflation be Falsified?
John D Barrow, Andrew R Liddle
Despite its central role in modern cosmology, doubts are often expressed as to whether cosmological inflation is really a falsifiable theory. We distinguish two facets of inflation…
A Gauge-invariant Analysis of Magnetic Fields in General Relativistic Cosmology
Christos G. Tsagas, John D. Barrow
We provide a fully general-relativistic treatment of cosmological perturbations in a universe permeated by a large-scale primordial magnetic field, using the Ellis-Bruni gauge-inva…
Geodesics in Open Universes
John D. Barrow, Janna Levin
We present the geodesics on homogeneous and isotropic negatively curved spaces in a simple form suitable for application to cosmological problems. We discuss how the patterns in th…
Flat Spots: topological signatures of an open universe in COBE sky maps
Janna J. Levin, John D. Barrow, Emory F. Bunn +1
We investigate the behaviour of light rays in an open universe with a partly periodic horn topology. The geodesics can be solved exactly and the periodic topology creates character…
Cosmological Limits on Slightly Skew Stresses
John D. Barrow
We present an analysis of the cosmological evolution of matter sources with small anisotropic pressures. This includes electric and magnetic fields, collisionless relativistic part…
Constraints on a Primordial Magnetic Field
John D. Barrow, Pedro G. Ferreira, Joseph Silk
We derive an upper limit of Gauss on the present strength of any primordial homogeneous magnetic field. The microwave background anisotro…