German translation: Dimensionen in denen nur die Schwerkraft wirkt.
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English term or phrase:large gravity-only dimensions
We are stuck in flatland. Only gravity is free to escape and roam in the higher dimensions - what science fiction writers call hyperspace, and physicists call "the bulk".
It's an attractive idea, because the existence of *large gravity-only dimensions* would explain, why gravity appears to be so weak, many orders of magnitude feebler than electromagnetic and nuclear forces.