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Ellipticity weakens chameleon screening

Burrage, Clare; Copeland, Edmund J.; Stevenson, James

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Authors

Edmund J. Copeland

James Stevenson



Abstract

The chameleon mechanism enables a long-range fifth force to be screened in dense environments when nontrivial self-interactions of the field cause its mass to increase with the local density. To date, chameleon fifth forces have mainly been studied for spherically symmetric sources; however, the nonlinear self-interactions mean that the chameleon responds to changes in the shape of the source differently to gravity. In this work we focus on ellipsoidal departures from spherical symmetry and compute the full form of the chameleon force, comparing its shape dependence to that of gravity. Enhancement of the chameleon force by up to 40% is possible when deforming a sphere to an ellipsoid of the same mass, with an ellipticity ?0.99.

Citation

Burrage, C., Copeland, E. J., & Stevenson, J. (2015). Ellipticity weakens chameleon screening. Physical Review D, D91(6), Article 065030. https://doi.org/10.1103/PhysRevD.91.065030

Journal Article Type Article
Acceptance Date Mar 25, 2015
Publication Date Mar 25, 2015
Deposit Date Apr 20, 2017
Publicly Available Date Mar 29, 2024
Journal Physical Review D
Print ISSN 2470-0010
Electronic ISSN 2470-0029
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume D91
Issue 6
Article Number 065030
DOI https://doi.org/10.1103/PhysRevD.91.065030
Public URL https://nottingham-repository.worktribe.com/output/746823
Publisher URL https://journals.aps.org/prd/abstract/10.1103/PhysRevD.91.065030

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