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Title: Chameleons with field-dependent couplings

Abstract

Certain scalar-tensor theories exhibit the so-called chameleon mechanism, whereby observational signatures of scalar fields are hidden by a combination of self-interactions and interactions with ambient matter. Not all scalar-tensor theories exhibit such a chameleon mechanism, which has been originally found in models with inverse power runaway potentials and field-independent couplings to matter. In this paper we investigate field theories with field-dependent couplings and a power-law potential for the scalar field. We show that the theory indeed is a chameleon field theory. We find the thin-shell solution for a spherical body and investigate the consequences for Eoet-Wash experiments, fifth-force searches and Casimir-force experiments. Requiring that the scalar field evades gravitational tests, we find that the coupling is sensitive to a mass scale which is of order of the Hubble scale today.

Authors:
 [1];  [2]; ;  [3];  [4]
  1. Institut de Physique Theorique, CEA, IPhT, CNRS, URA 2306, F-91191Gif/Yvette Cedex (France)
  2. Department of Applied Mathematics, University of Sheffield, Hounsfield Road, Sheffield S3 7RH (United Kingdom)
  3. Institute of Theoretical Astrophysics, University of Oslo, 0315 Oslo (Norway)
  4. Institut fuer Theoretische Physik, Universitaet Heidelberg, Philosophenweg 16, D-69120 Heidelberg (Germany)
Publication Date:
OSTI Identifier:
21432355
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 82; Journal Issue: 8; Other Information: DOI: 10.1103/PhysRevD.82.083503; (c) 2010 American Institute of Physics
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CASIMIR EFFECT; COUPLING; FIELD THEORIES; HUBBLE EFFECT; INTERACTIONS; MASS; MATHEMATICAL SOLUTIONS; SCALAR FIELDS; SIMULATION; SPHERICAL CONFIGURATION; CONFIGURATION

Citation Formats

Brax, Philippe, Bruck, Carsten van de, Mota, David F., Winther, Hans A., and Nunes, Nelson J. Chameleons with field-dependent couplings. United States: N. p., 2010. Web. doi:10.1103/PHYSREVD.82.083503.
Brax, Philippe, Bruck, Carsten van de, Mota, David F., Winther, Hans A., & Nunes, Nelson J. Chameleons with field-dependent couplings. United States. doi:10.1103/PHYSREVD.82.083503.
Brax, Philippe, Bruck, Carsten van de, Mota, David F., Winther, Hans A., and Nunes, Nelson J. Fri . "Chameleons with field-dependent couplings". United States. doi:10.1103/PHYSREVD.82.083503.
@article{osti_21432355,
title = {Chameleons with field-dependent couplings},
author = {Brax, Philippe and Bruck, Carsten van de and Mota, David F. and Winther, Hans A. and Nunes, Nelson J.},
abstractNote = {Certain scalar-tensor theories exhibit the so-called chameleon mechanism, whereby observational signatures of scalar fields are hidden by a combination of self-interactions and interactions with ambient matter. Not all scalar-tensor theories exhibit such a chameleon mechanism, which has been originally found in models with inverse power runaway potentials and field-independent couplings to matter. In this paper we investigate field theories with field-dependent couplings and a power-law potential for the scalar field. We show that the theory indeed is a chameleon field theory. We find the thin-shell solution for a spherical body and investigate the consequences for Eoet-Wash experiments, fifth-force searches and Casimir-force experiments. Requiring that the scalar field evades gravitational tests, we find that the coupling is sensitive to a mass scale which is of order of the Hubble scale today.},
doi = {10.1103/PHYSREVD.82.083503},
journal = {Physical Review. D, Particles Fields},
number = 8,
volume = 82,
place = {United States},
year = {Fri Oct 15 00:00:00 EDT 2010},
month = {Fri Oct 15 00:00:00 EDT 2010}
}