30 citations · 90 across the 4 of their papers we have counts for
4 papers
Varying Alpha: New Constraints from Seasonal Variations
John D. Barrow, Douglas J. Shaw
We analyse the constraints obtained from new atomic clock data on the possible time variation of the fine structure `constant' and the electron-proton mass ratio and show how they…
Testing Alternative Theories of Dark Matter with the CMB
Baojiu Li, John D. Barrow, David F. Mota +1
We propose a method to study and constrain modified gravity theories for dark matter using CMB temperature anisotropies and polarization. We assume that the theories considered her…
Slow decay of magnetic fields in open Friedmann universes
John D. Barrow, Christos G. Tsagas
We describe how magnetic fields in Friedmann universes can experience superadiabatic growth without departing from conventional electromagnetism. The reason is the relativistic cou…
The Stability of an Isotropic Cosmological Singularity in Higher-Order Gravity
Jonathan Middleton, John D. Barrow
We study the stability of the isotropic vacuum Friedmann universe in gravity theories with higher-order curvature terms of the form added to the Einstein-Hilbe…