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Recent research, published in Nature (Anderson et al, 2023) shows that antimatter, in the form of antihydrogen, falls freely in the presence of a gravitational field. This ought to come as no surprise to any physicist, as it follows, logically, from the Special Theory of Relativity, which proposes that mass and energy are equivalent, and the General Theory of Relativity, which proposes that mass energy produces gravitational fields, and is affected by them. As antimatter possesses both mass and energy, if the experiment conducted by Anderson and his colleagues had shown any other reaction to the one it did, they would have disproved both of Einstein’s theories. ‘Exotic matter’, rather than antimatter, is the kind that can be expected to evoke an ‘anti-gravity’ effect.
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