PHYSICS11 November 2022
ByKAZUYA KOYAMA & LEVON POGOSIAN, THE CONVERSATION
(Mark Garlick/Science Photo Library/Getty Images)
Everything in the Universe has gravity – and feels it too. Yet this most common of all fundamental forces is also the one that presents the biggest challenges to physicists.
Albert Einstein’s theory of general relativityhas been remarkably successful in describing the gravity of stars and planets, but it doesn’t seem to apply perfectly on all scales.
General relativityhas passed many years of observational tests, fromEddington’s measurementof the deflection of starlight by the Sun in 1919 to therecent detection of gravitational waves.
However, gaps in our understanding start to appear when we try to apply it to extremely small distances, wherethe laws of quantum mechanics operate, or when we try to describe the entire universe.
Our new study,published inNature Astronomy, has…
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