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What if dark matter is not a particle? The second wind of modified gravity.

12 Oct 2016, 08:13 UTC
What if dark matter is not a particle? The second wind of modified gravity. NASA
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Another year has passed and Vera Rubin was not awarded the Nobel Prize. She’s 88 and the prize can’t be awarded posthumously, so I can’t shake the impression the Royal Academy is waiting for her to die while they work off a backlog of condensed-matter breakthroughs. Sure, nobody knows whether galaxies actually contain the weakly interacting and non-luminous particles we have come to call dark matter. And Fritz Zwicky was first to notice a cluster of galaxies which moved faster than the visible mass alone could account for – and the one to coin the term dark matter. But it was Rubin who pinned down the evidence that galaxies are systematically misbehaved by showing the rotational velocities of spiral galaxies don’t flatten out with distance from the galactic center – as if there was unseen extra mass in the galaxies. And Zwicky is dead anyway, so the Nobel committee doesn’t have to worry about him. After Rubin’s discovery, many other observations confirmed that we were missing matter, and not only a little bit, but 80% of all matter in the universe. It’s there, but it’s not some stuff that we know. The fluctuations in the cosmic microwave background, gravitational lensing, ...

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