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2011

Chameleon Gravity, Electrostatics, and Kinematics in the Outer Galaxy

Pourhasan, R., Afshordi, N., Mann, R. B. et al.

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Light scalar fields are expected to arise in theories of high energy physics (such as string theory), and find phenomenological motivations in dark energy, dark matter, or neutrino physics.

However, the coupling of light scalar fields to ordinary (or dark) matter is strongly constrained from laboratory, solar system, and astrophysical tests of fifth force.
One way to evade these constraints in dense environments is through the chameleon mechanism, where the field's mass steeply increases with ambient density.
Consequently, the chameleonic force is only sourced by a thin shell near the surface of dense objects, which significantly reduces its magnitude.

Chameleon Gravity, Electrostatics, and Kinematics in the Outer Galaxy · Around

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