An incredibly sensitive test to detect a mysterious fifth fundamental force known as the chameleon force hints that it isn’t a valid candidate for dark energy
, but limitations in the size or scope of those experiments mean that the force might still have been lurking at energy scales we couldn’t probe.at Nanjing University in China and his colleagues have devised an experiment that uses a magnetically levitated strip of graphite and a test mass to look for evidence for this mysterious effect at previously unmeasured scales that fill in the gap between the past pendulum and atom experiments.
The result is important for narrowing down the scales and energies at which a chameleon force might act, says
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