Simple Types of Anisotropic Inflation (2009)
We display some simple cosmological solutions of gravity theories with quadratic Ricci curvature terms added to the Einstein-Hilbert lagrangian which exhibit anisotropic inflation. The Hubble...
Webb Barrow, M. J. Drinkwater, J. K. Webb, J. D. Barrow, V. V. Flambaum
. 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 variation in y j...
New Limits on the Possible Variation of Physical Constants (2007)
M. J. Drinkwater, J. K. Webb, J. D. Barrow, V. V. Flambaum
Recent detections of high-redshift absorption by both atomic hydrogen and molecular gas in the radio spectra of quasars have provided a powerful tool to measure possible temporal and spatial...
Cosmology with inhomogeneous magnetic fields (2006)
Barrow, J. D., Maartens, R., Tsagas, C. G.
We review spacetime dynamics in the presence of large-scale electromagnetic fields and then consider the effects of the magnetic component on perturbations to a spatially homogeneous and isotropic...
Constraints on the Variation of G from Primordial Nucleosynthesis (2005)
Clifton, T., Barrow, J. D., Scherrer, R. J.
We study here the effect of a varying G on the evolution of the early Universe and, in particular, on primordial nucleosynthesis. This variation of G is modelled using the Brans-Dicke theory as well...
Clifton, T., Mota, D. F., Barrow, J. D.
We study the inhomogeneous cosmological evolution of the Newtonian gravitational 'constant' G in the framework of scalar-tensor theories. We investigate the differences that arise between the...
Local and Global Variations of The Fine Structure Constant (2003)
Using the BSBM varying-alpha theory, with dark matter dominated by magnetic energy, and the spherical collapse model for cosmological structure formation, we have studied the effects of the...
Varying Alpha in a More Realistic Universe (2003)
We study the space-time evolution of the fine structure constant, $\alpha$, inside evolving spherical overdensities in a lambda-CDM Friedmann universe using the spherical infall model. We show that...
A Cosmological Tale of Two Varying Constants (2002)
Barrow, J. D., Magueijo, J., Sandvik, H. B.
We formulate a simple extension of general relativity which incorporates space-time variations in the Newtonian gravitation 'constant', $G$, and the fine structure 'constant', $\alpha $, which...
Variations of Alpha in Space and Time (2002)
Barrow, J. D., Magueijo, J., Sandvik, H. B.
We study inhomogeneous cosmological variations in the fine structure 'constant', $\alpha ,$ in Friedmann universes. Inhomogeneous motions of the scalar field driving changes in $\alpha $ display...
Anthropic Reasons for Non-Zero Flatness and Lambda (2001)
Barrow, J. D., Sandvik, H. B., Magueijo, J.
In some cosmological theories with varying constants there are anthropic reasons why the expansion of the universe must not be too {\it close} to flatness or the cosmological constant too close to...
The Behaviour of Varying-Alpha Cosmologies (2001)
Barrow, J. D., Sandvik, H. B., Magueijo, J.
We determine the behaviour of a time-varying fine structure 'constant' $\alpha (t)$ during the early and late phases of universes dominated by the kinetic energy of changing $\alpha (t)$, radiation,...
A Simple Varying-alpha Cosmology (2001)
Sandvik, H. B., Barrow, J. D., Magueijo, J.
We investigate the cosmological consequences of a simple theory in which the electric charge $e$ is allowed to vary. The theory is locally gauge and Lorentz invariant, and satisfies general...
Further evidence for cosmological evolution of the Fine Structure Constant (2001)
Prochaska, J, Wolfe, A, ...
We describe the results of a search for time variability of the fine structure constant a using absorption systems in the spectra of distant quasars. Three large optical data sets and two 21 cm and...
Further Evidence for Cosmological Evolution of the Fine Structure Constant (2001)
Barrow, J. D., Dzuba, V. A., Flambaum, V. V., Murphy, M. T., Webb, J. K.
Further Evidence for Cosmological Evolution of the Fine Structure Constant (2000)
Webb, J. K., Murphy, M. T., Flambaum, V. V., Dzuba, V. A., Barrow, J. D., Churchill, C. W., ...
We describe the results of a search for time variability of the fine structure constant, alpha, using absorption systems in the spectra of distant quasars. Three large optical datasets and two...
Murphy, M. T., Webb, J. K., Flambaum, V. V., Dzuba, V. A., Churchill, C. W., Prochaska, J. X., ...
An experimental search for variation in the fundamental coupling constants is strongly motivated by modern high-energy physics theories. Comparison of quasar absorption line spectra with laboratory...
Some exact non-vacuum Bianchi VI0 and VII0 instantons (1999)
Barrow, J. D., Gaspar, Y., Saffin, P. M.
We report some new exact instantons in general relativity. These solutions are K\"ahler and fall into the symmetry classes of Bianchi types VI0 and VII0, with matter content of a stiff fluid. The...
New Limits on the Possible Variation of Physical Constants (1997)
Drinkwater, M. J., Webb, J. K., Barrow, J. D., Flambaum, V. V.
Recent detections of high-redshift absorption by both atomic hydrogen and molecular gas in the radio spectra of quasars have provided a powerful tool to measure possible temporal and spatial...
Limits on the Variability of Physical Constants (1997)
Drinkwater, M. J., Webb, J. K., Barrow, J. D., Flambaum, V. V.
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 variation in y =...
First ranked galaxies in groups and clusters. (1985)
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Minimal spanning trees, filaments and galaxy clustering (1985)
Barrow, J.D., Bhavsar, S.P., Sonoda, D.H.
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A bootstrap resampling analysis of galaxy clustering. (1984)
Barrow, J.D., Bhavsar, S.P., Sonoda, D.H.
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