137 citations · 422 across the 9 of their papers we have counts for
9 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…
Microscopic and Macroscopic Behaviors of Palatini Modified Gravity Theories
Baojiu Li, David F. Mota, Douglas J. Shaw
We show that, within modified gravity, the non-linear nature of the field equations implies that the usual naive averaging procedure (replacing the microscopic energy-momentum by i…
Beyond the Chameleon Mechanism
David F. Mota, Douglas J. Shaw
As a result of non-linear self-interactions, in chameleon theories where the field couples to matter much more strongly than gravity does, the fifth force between two bodies with t…
Some Late-time Asymptotics of General Scalar-Tensor Cosmologies
John D. Barrow, Douglas J. Shaw
We study the asymptotic behaviour of isotropic and homogeneous universes in general scalar-tensor gravity theories containing a p=-rho vacuum fluid stress and other sub-dominant ma…
Hidden in the Light: Magnetically Induced Afterglow from Trapped Chameleon Fields
Holger Gies, David F. Mota, Douglas J. Shaw
We propose an afterglow phenomenon as a unique trace of chameleon fields in optical experiments. The vacuum interaction of a laser pulse with a magnetic field can lead to a product…
Detecting Chameleons through Casimir Force Measurements
Philippe Brax, Carsten van de Bruck, Anne-Christine Davis +2
The best laboratory constraints on strongly coupled chameleon fields come not from tests of gravity per se but from precision measurements of the Casimir force. The chameleonic for…