How Weak Gravity Does Without Dark Matter ⚡ экспресс
Original: "A Relativistic MOND"
Scientists have found a way to explain galaxy rotation by changing the law of gravity on the outskirts—no dark matter required.
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At the edges of galaxies, gravity is so weak that it begins to behave not as usual, but obeys a strange symmetry linked to the size of the entire universe. A new theory explains this without dark matter and may change our understanding of the cosmos.
🎯 The critical acceleration at which gravity changes its behavior is about a hundred billion times smaller than what we feel on Earth. That's like the difference between a thunderclap and the flutter of a butterfly's wing.
a_0 = \frac{c^2}{\xi \ell_{\rm dS}}
a0 — critical acceleration, c — speed of light, ℓ_dS — de Sitter radius (characteristic size of the universe), ξ — a number close to one.