期刊
PHYSICAL REVIEW LETTERS
卷 108, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.221101
关键词
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资金
- U.S. DOE [DE-FG02-91ER40628]
- NSF [PHY-0855580]
- Division Of Physics
- Direct For Mathematical & Physical Scien [0855580] Funding Source: National Science Foundation
The late-time accelerated expansion of the Universe could be caused by a scalar field that is screened on small scales, as in the case of chameleon or symmetron scenarios. We present an analogy between such scalar fields and electrostatics, which allows calculation of the field profile for general extended bodies. Interestingly, the field demonstrates a lightning rod effect, where it becomes enhanced near the ends of a pointed or elongated object. Drawing from this correspondence, we show that nonspherical test bodies immersed in a background field will experience a net torque caused by the scalar field. This effect, with no counterpart in the gravitational case, can be potentially tested in future experiments.
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