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Ellipticity weakens chameleon screening

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

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.

Journal Article Type Article
Publication Date Mar 25, 2015
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
APA6 Citation Burrage, C., Copeland, E. J., & Stevenson, J. (2015). Ellipticity weakens chameleon screening. Physical Review D, D91(6), https://doi.org/10.1103/PhysRevD.91.065030
DOI https://doi.org/10.1103/PhysRevD.91.065030
Publisher URL https://journals.aps.org/prd/abstract/10.1103/PhysRevD.91.065030
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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