Dark Matter May Be Less Abundant Due to Galaxy Shape ⚡ экспресс
Original: "Galactic Rotation Curves from Full-Disk Newtonian Modeling: The Lost and Found Framework"
Accounting for the pancake shape of galaxies slashes the need for dark matter by a third—part of the hidden mass was just an error in oversimplified models.
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Galaxies resemble giant pancakes, and their shape affects gravity more than previously thought. A new calculation shows that some of the mysterious dark matter may be just an illusion born from oversimplified models. Stars at the edge of the disk feel the pull of the entire 'pancake,' not just the inner mass.
🎯 In a flat galaxy, gravity at the outskirts doesn't weaken as sharply as in a sphere—the remote parts of the disk still pull.
🎬 If there's a third less dark matter, then even in the reality described by Blake Crouch in 'Dark Matter,' there's a little less magic.
v^2(R) = \frac{G M(<R)}{R}
The rotational speed v at distance R from the center in a spherical model depends only on the mass inside that radius.