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Massive Galileons and Vainshtein Screening
Clare Burrage, Ben Coltman, Antonio Padilla +2
The Vainshtein screening mechanism relies on nonlinear interaction terms becoming dominant close to a compact source. However, theories displaying this mechanism are generally unde…
Influence functionals, decoherence and conformally coupled scalars
Clare Burrage, Christian Käding, Peter Millington +1
Some of the simplest modifications to general relativity involve the coupling of additional scalar fields to the scalar curvature. By making a Weyl rescaling of the metric, these t…
Open quantum dynamics induced by light scalar fields
Clare Burrage, Christian Käding, Peter Millington +1
We consider the impact of a weakly coupled environment comprising a light scalar field on the open dynamics of a quantum probe field, resulting in a master equation for the probe f…
Particle level screening of scalar forces in 1+1 dimensions
Clare Burrage, Benjamin Elder, Peter Millington
We investigate how non-linear scalar field theories respond to point sources. Taking the symmetron as a specific example of such a theory, we solve the non-linear equation of motio…
Fifth forces, Higgs portals and broken scale invariance
Clare Burrage, Edmund J. Copeland, Peter Millington +1
We study the relationship between the strength of fifth forces and the origin of scale breaking in the Standard Model (SM) of particle physics. We start with a light scalar field t…
Ellipticity Weakens Chameleon Screening
Clare Burrage, Edmund J. Copeland, James Stevenson
The chameleon mechanism enables a long range fifth force to be screened in dense environments when non-trivial self interactions of the field cause its mass to increase with the lo…
D-BIonic Screening of Scalar Fields
Clare Burrage, Justin Khoury
We study a new screening mechanism which is present in Dirac-Born-Infeld (DBI)-like theories. A scalar field with a DBI-like Lagrangian is minimally coupled to matter. In the vicin…
Strong Coupling and Bounds on the Graviton Mass in Massive Gravity
Clare Burrage, Nemanja Kaloper, Antonio Padilla
The theory of a single massive graviton has a cutoff much below its Planck scale, because the extra modes from the graviton multiplet involve higher derivative self-interactions, c…
Screening fifth forces in k-essence and DBI models
Philippe Brax, Clare Burrage, Anne-Christine Davis
New fifth forces have not yet been detected in the laboratory or in the solar system, hence it is typically difficult to introduce new light scalar fields that would mediate such f…
Shining Light on Modifications of Gravity
Philippe Brax, Clare Burrage, Anne-Christine Davis
Many modifications of gravity introduce new scalar degrees of freedom, and in such theories matter fields typically couple to an effective metric that depends on both the true metr…
Chronology Protection in Galileon Models and Massive Gravity
Clare Burrage, Claudia de Rham, Lavinia Heisenberg +1
Galileon models are a class of effective field theories that have recently received much attention. They arise in the decoupling limit of theories of massive gravity, and in some c…
Anomalous coupling of scalars to gauge fields
Philippe Brax, Clare Burrage, Anne-Christine Davis +2
We study the transformation properties of a scalar-tensor theory, coupled to fermions, under the Weyl rescaling associated with a transition from the Jordan to the Einstein frame.…
Galileon inflation
Clare Burrage, Claudia de Rham, David Seery +1
Galileon inflation is a radiatively stable higher derivative model of inflation. The model is determined by a finite number of relevant operators which are protected by a covariant…
P-term Strings and Semi-local Strings
C. Burrage, A. C. Davis
P-term potentials can give rise to Nielsen-Olesen or semi-local cosmic strings. We present a general analysis of these cosmic strings where we derive the Bogomol'nyi equations and…
P-term Potentials from 4-D Supergravity
C. Burrage, A. C. Davis
P-term inflation arises in some models of brane inflation. Within N=2 supersymmetry the scalar potential contains a vector of Fayet-Iliopoulos (FI) terms . Depending on the di…