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Many theoretical approaches that work toward a quantum theory of gravity suggest that all of spacetime should be filled with an energy that is as much as 10 20 times larger than observations allow. Theorists have proposed various tweaks to make this energy go away, but a new proposal hints at a different type of solution: the energy really is huge, but it has no large-scale significance for cosmic expansion because its effects cancel out on the very smallest scales.

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Category: Science