513 citations · 6.8k across the 165 of their papers we have counts for
48 papers · 1 filter
Hide and Seek: Screened Scalar Fields in Hydrogen and Muonium
Philippe Brax, Anne-Christine Davis, Benjamin Elder
We compute bounds on screened scalar field theories from hydrogen-like systems. New light scalar fields generically have a direct coupling to matter. Such a coupling is strongly co…
Muon and Screened Modified Gravity
Philippe Brax, Anne-Christine Davis, Benjamin Elder
We show how light scalar fields can account for the discrepancy between the theoretical and observed values of the anomalous magnetic moment of the (anti)muon. When coupled to both…
Direct detection of dark energy: the XENON1T excess and future prospects
Sunny Vagnozzi, Luca Visinelli, Philippe Brax +2
We explore the prospects for direct detection of dark energy by current and upcoming terrestrial dark matter direct detection experiments. If dark energy is driven by a new light d…
Constraining screened fifth forces with the electron magnetic moment
Philippe Brax, Anne-Christine Davis, Benjamin Elder +1
Chameleon and symmetron theories serve as archetypal models for how light scalar fields can couple to matter with gravitational strength or greater, yet evade the stringent constra…
Casimir, Gravitational and Neutron Tests of Dark Energy
Philippe Brax, Anne-Christine Davis
We investigate laboratory tests of dark energy theories which modify gravity in a way generalising the inverse power law chameleon models. We make use of the tomographic descriptio…
Supersymmetron
Philippe Brax, Anne-Christine Davis
We consider a supersymmetric model of dark energy coupled to cold dark matter: the supersymmetron. In the absence of cold dark matter, the supersymmetron converges to a supersymmet…
Laboratory Tests of the Galileon
Philippe Brax, Clare Burrage, Anne-Christine Davis
The Galileon model is a ghost free scalar effective field theory containing higher derivative terms that are protected by the Galileon symmetry. The presence of a Vainshtein screen…
Searching for Axion-like Particles with Active Galactic Nuclei
Clare Burrage, Anne-Christine Davis, Douglas J. Shaw
Strong mixing between photons and axion-like particles in the magnetic fields of clusters of galaxies induces a scatter in the observed luminosities of compact sources in the clust…
Laboratory Tests of Chameleon Models
Philippe Brax, Carsten van de Bruck, Anne-Christine Davis +1
We present a cursory overview of chameleon models of dark energy and their laboratory tests with an emphasis on optical and Casimir experiments. Optical experiments measuring the e…
Higgs production as a probe of Chameleon Dark Energy
Philippe Brax, Clare Burrage, Anne-Christine Davis +2
In this paper we study various particle physics effects of a light, scalar dark energy field with chameleon-like couplings to matter. We show that a chameleon model with only matte…
Collider constraints on interactions of dark energy with the Standard Model
Philippe Brax, Clare Burrage, Anne-Christine Davis +2
We study models in which a light scalar dark energy particle couples to the gauge fields of the electroweak force, the photon, Z and W bosons. Our analysis applies to a large class…
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…
Testing Chameleon Theories with Light Propagating through a Magnetic Field
P. Brax, C. van de Bruck, A. C. Davis +2
It was recently argued that the observed PVLAS anomaly can be explained by chameleon field theories in which large deviations from Newton's law can be avoided. Here we present the…
Compatibility of the chameleon-field model with fifth-force experiments, cosmology, and PVLAS and CAST results
Ph. Brax, C. van de Bruck, A. -C. Davis
We analyse the PVLAS results using a chameleon field whose properties depend on the environment. We find that, assuming a runaway bare potential and a universal coupling to…
Cosmic Superstrings and Primordial Magnetogenesis
Anne-Christine Davis, Konstantinos Dimopoulos
Cosmic superstrings are produced at the end of brane inflation. Their properties are similar to cosmic strings arising in grand unified theories. Like cosmic strings they can give…
Exact Evolution of the Complete Non-Linear Cosmological Radion
Ian R. Vernon, Anne-Christine Davis
The cosmological two brane model is discussed in detail. An elegant method for deriving the generalised non-linear equations for the interbrane distance is presented. These equatio…
Brane World Moduli and the CMB
Ph. Brax, C. van de Bruck, A. -C. Davis +1
The evolution of moduli fields, which naturally appear in higher dimensional models such as brane worlds, and their effects on the anisotropies of the cosmological microwave backgr…
Branes at low energy
Ph. Brax, C. van de Bruck, A. -C. Davis +1
Brane models at low energy are described by an effective action involving gravity and two moduli fields associated with the brane positions. The scalar-tensor nature of the effecti…
Microwave Background Constraints on Decaying Defects
Robert H. Brandenberger, Brandon Carter, Anne-Christine Davis
Embedded defects are predicted in a host of particle physics theories, in particular in the standard electroweak theory. They can be stabilized by interactions with the cosmologica…
Thermal Stabilisation of Superconducting Sigma Strings and their Drum Vortons
Brandon Carter, Robert H. Brandenberger, Anne-Christine Davis
We discuss various issues related to stabilized embedded strings in a thermal background. In particular, we demonstrate that such strings will generically become superconducting at…
Branes on the Horizon
Anne-Christine Davis, Christophe Rhodes, Ian Vernon
Models with extra dimensions are often invoked to resolve cosmological problems. We investigate the possibility of apparent acausality as seen by a brane-based observer resulting f…
Cosmological Phase Transitions in a Brane World
Stephen C. Davis, Warren B. Perkins, Anne-Christine Davis +1
In brane world scenarios the Friedmann equation is modified, resulting in an increased expansion at early times. This has important effects on cosmological phase transitions which…
Brane World Cosmology Without the Z_2 Symmetry
Anne-Christine Davis, Ian Vernon, Stephen C. Davis +1
The Friedmann equation for a positive tension brane situated between two bulk spacetimes that posses the same 5D cosmological constant, but which does not posses a Z_2 symmetry of…
The Fate of Cosmic String Zero Modes
Anne-Christine Davis, Stephen C. Davis, Warren B. Perkins
Cosmic strings in realistic particle physics models have fermion zero modes in the string core. Such zero modes change the underlying cosmology; for example, the string can carry a…