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Detecting dark energy in orbit: The cosmological chameleon
- P. Brax, C. V. D. Bruck, A. Davis, J. Khoury, A. Weltman
- Physics
- 23 August 2004
We show that the chameleon scalar field can drive the current phase of cosmic acceleration for a large class of scalar potentials that are also consistent with local tests of gravity. These provide…
Unified description of screened modified gravity.
- P. Brax, A. Davis, Baojiu Li, H. Winther
- Physics
- 21 March 2012
We consider modified gravity models driven by a scalar field whose effects are screened in high density regions due to the presence of nonlinearities in its interaction potential and/or its coupling…
Brane world cosmology
- P. Brax, C. V. D. Bruck, A. Davis
- Physics
- 2 April 2004
Recent developments in the physics of extra dimensions have opened up new avenues to test such theories. We review cosmological aspects of brane world scenarios such as the Randall–Sundrum brane…
f(R) gravity and chameleon theories
- P. Brax, C. V. D. Bruck, A. Davis, D. Shaw
- Physics
- 20 June 2008
We analyze f(R) modifications of Einstein's gravity as dark energy models in the light of their connection with chameleon theories. Formulated as scalar-tensor theories, the f(R) theories imply the…
STRUCTURE FORMATION IN THE SYMMETRON MODEL
- A. Davis, Baojiu Li, D. Mota, H. Winther
- Physics
- 15 August 2011
Scalar fields, strongly coupled to matter, can be present in nature and still be invisible to local experiments if they are subject to a screening mechanism. The symmetron is one such mechanism that…
Relaxing the bounds on primordial magnetic seed fields
- A. Davis, M. Lilley, O. Tornkvist
- Physics
- 2 April 1999
Department of Applied Mathematics and Theoretical Physics, University of Cambridge,Silver Street, Cambridge CB3 9EW, United Kingdom(March 27, 1999)We point out that the lower bound on the primordial…
N=1 Supersymmetric Cosmic Strings
- S. C. Davis, A. Davis, M. Trodden
- Physics
- 18 February 1997
Formation and interactions of topological defects
- A. Davis, R. Brandenberger
- Physics
- 1995
Topological defects, the unavoidable result of many symmetry-breaking phase transitions, can reveal the properties of many condensed matter systems, may be responsible for seeding the density…
Shape dependence of Vainshtein screening
- Jolyon K. Bloomfield, C. Burrage, A. Davis
- Physics
- 18 August 2014
Scalar field theories that possess a Vainshtein mechanism are able to dynamically suppress the associated fifth forces in the presence of massive sources through derivative nonlinearities. The…
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