827 citations · 16k across the 208 of their papers we have counts for
9 papers · 1 filter
Anthropic Reasons for Non-Zero Flatness and Lambda
J. D. Barrow, H. B. Sandvik, J. Magueijo
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 const…
Magnetic Brane-worlds
John D. Barrow, Sigbjorn Hervik
We investigate brane-worlds with a pure magnetic field and a perfect fluid. We extend earlier work to brane-worlds, and find new properties of the Bianchi type I brane-world. We fi…
Kaluza-Klein anisotropy in the CMB
John D Barrow, Roy Maartens
We show that 5-dimensional Kaluza-Klein graviton stresses can slow the decay of shear anisotropy on the brane to observable levels, and we use cosmic microwave background anisotrop…
A Simple Varying-alpha Cosmology
H. B. Sandvik, J. D. Barrow, J. Magueijo
We investigate the cosmological consequences of a simple theory in which the electric charge is allowed to vary. The theory is locally gauge and Lorentz invariant, and satisfie…
Scaling Solutions and reconstruction of Scalar Field Potentials
Claudio Rubano, John D. Barrow
Starting from the hypothesis of scaling solutions, the general exact form of the scalar field potential is found. In the case of two fluids, it turns out to be a negative power of…
All Universes Great and Small
John D. Barrow, Hideo Kodama
If the topology of the universe is compact we show how it significantly changes our assessment of the naturalness of the observed structure of the universe and the likelihood of it…
Cosmological Evolution of Black Holes in Brans-Dicke Gravity
Nobuyuki Sakai, John D. Barrow
We consider a modified ``Swiss cheese'' model in Brans-Dicke theory, and use it to discuss the evolution of black holes in an expanding universe. We define the black hole radius by…
Bianchi VIII Empty Futures
John D. Barrow, Yves Gaspar
Using a qualitative analysis based on the Hamiltonian formalism and the orthonormal frame representation we investigate whether the chaotic behaviour which occurs close to the init…
The twin paradox in compact spaces
John D. Barrow, Janna Levin
Twins travelling at constant relative velocity will each see the other's time dilate leading to the apparent paradox that each twin believes the other ages more slowly. In a finite…