<ul><li>Dark matter made out of axions may have the power to make space-time ring like a bell, but only if it is able to steal energy from black holes.</li><li>Axions, a potential candidate for dark matter, have yet to be detected in the laboratory or in any experiments.</li><li>If axions or similar particles are the dark matter, they would be extremely lightweight and behave more like waves than particles.</li><li>Through a process called super-radiance, axion dark matter could steal angular momentum from black holes, resulting in the emission of gravitational waves.</li></ul>

Axion dark matter may make spacetime ring

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