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Chameleons with field-dependent couplings

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 origina...

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Hauptverfasser: Brax, Philippe (VerfasserIn) , Bruck, Carsten van de (VerfasserIn) , Mota, David F. (VerfasserIn) , Nunes, Nelson (VerfasserIn) , Winther, Hans A. (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 6 October 2010
In: Physical review. D, Particles, fields, gravitation, and cosmology
Year: 2010, Jahrgang: 82, Heft: 8, Pages: 1-17
ISSN:1550-2368
DOI:10.1103/PhysRevD.82.083503
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevD.82.083503
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevD.82.083503
Volltext
Verfasserangaben:Philippe Brax, Carsten van de Bruck, David F. Mota, Nelson J. Nunes, and Hans A. Winther
Beschreibung
Zusammenfassung: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 Eöt-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.
Beschreibung:Gesehen am 22.02.2023
Beschreibung:Online Resource
ISSN:1550-2368
DOI:10.1103/PhysRevD.82.083503

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