Ellipticity weakens chameleon screeningTools Burrage, Clare, Copeland, Edmund J. and Stevenson, James (2015) Ellipticity weakens chameleon screening. Physical Review D, D91 (6). 065030/1-065030/16. ISSN 2470-0029 Full text not available from this repository.AbstractThe 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.
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