4 citations · 4 across the 1 of their papers we have counts for
7 papers
A Test of a Test for Chaos
John D. Barrow, Janna Levin
A simple new binary test for chaos has been proposed by Gottwald and Melbourne. We apply this test successfully to the Henon-Heiles and Lorenz systems, demonstrating its applicabil…
Evolution of Black Holes in Brans-Dicke Cosmology
Nobuyuki Sakai, John D. Barrow
We consider a modified ``Swiss cheese'' model in the Brans-Dicke theory, and discuss the evolution of black holes in the expanding universe. We define the black hole radius by the…
Cosmology and the Origin of Life
John D. Barrow
We discuss some of the cosmological constraints on the evolution and persistence of life in the Universe and in hypothetical universes other than our own. We highlight the role pla…
String Cosmology and Chaos
John D. Barrow, Mariusz P. Dabrowski
We investigate Bianchi type IX ''Mixmaster'' universes within the framework of the low-energy tree-level effective action for string theory, which (when the ''stringy'' 2-form axio…
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…
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…