All Outputs (46)

Probing dark energy with atom interferometry (2015)
Journal Article
Burrage, C., Copeland, E. J., & Hinds, E. A. (2015). Probing dark energy with atom interferometry. Journal of Cosmology and Astroparticle Physics, 2015(3), Article 042. https://doi.org/10.1088/1475-7516/2015/03/042

© 2015 IOP Publishing Ltd and Sissa Medialab srl. Theories of dark energy require a screening mechanism to explain why the associated scalar fields do not mediate observable long range fifth forces. The archetype of this is the chameleon field. Here... Read More about Probing dark energy with atom interferometry.

Cosmological tests of coupled Galileons (2015)
Journal Article
Brax, P., Burrage, C., Davis, A.-C., & Gubitosi, G. (2015). Cosmological tests of coupled Galileons. Journal of Cosmology and Astroparticle Physics, 15(3), Article 028. https://doi.org/10.1088/1475-7516/2015/03/028

We investigate the cosmological properties of Galileon models which admit Minkowski space as a stable solution in vacuum. This is motivated by stable, positive tension brane world constructions that give rise to Galileons. We include both conformal a... Read More about Cosmological tests of coupled Galileons.

Explaining the proton radius puzzle with disformal scalars (2015)
Journal Article
Brax, P., & Burrage, C. (2015). Explaining the proton radius puzzle with disformal scalars. Physical Review D, D91(4), Article 043515. https://doi.org/10.1103/PhysRevD.91.043515

We analyze the consequences of a disformal interaction between a massless scalar and matter particles in the context of atomic physics. We focus on the displacement of the atomic energy levels that it induces, and in particular the change in the Lamb... Read More about Explaining the proton radius puzzle with disformal scalars.

Constraining disformally coupled scalar fields (2014)
Journal Article
Brax, P., & Burrage, C. (2014). Constraining disformally coupled scalar fields. Physical Review D, D90(10), Article 104009. https://doi.org/10.1103/PhysRevD.90.104009

Light scalar fields can naturally couple disformally to matter fields. Static, nonrelativistic sources do not generate a classical field profile for a disformally coupled scalar, and so such scalars are free from the constraints on the existence of f... Read More about Constraining disformally coupled scalar fields.

Screening of scalar fields in Dirac-Born-Infeld theory (2014)
Journal Article
Burrage, C., & Khoury, J. (2014). Screening of scalar fields in Dirac-Born-Infeld theory. Physical Review D, D90(2), Article 024001. https://doi.org/10.1103/PhysRevD.90.024001

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 vicinity of sufficiently dense sources, nonlinearities in the scalar domina... Read More about Screening of scalar fields in Dirac-Born-Infeld theory.

Chameleons in the early universe: kicks, rebounds, and particle production (2014)
Journal Article
Erickcek, A. L., Barnaby, N., Burrage, C., & Huang, Z. (2014). Chameleons in the early universe: kicks, rebounds, and particle production. Physical Review D, D89(8), Article 084074. https://doi.org/10.1103/PhysRevD.89.084074

Chameleon gravity is a scalar-tensor theory that includes a nonminimal coupling between the scalar field and the matter fields and yet mimics general relativity in the Solar System. The scalar degree of freedom is hidden in high-density environments... Read More about Chameleons in the early universe: kicks, rebounds, and particle production.