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Is Dark Energy Getting Weaker? New Evidence Strengthens the Case
Last year, an enormous map of the cosmos hinted that the engine driving cosmic expansion might be sputtering. Now physicists are back with an even bigger map, and a stronger conclusion.
“It’s interesting that things are pushing in this direction and that multiple experiments are seeing some tension” with the idea that dark energy is constant, said Michael Troxel, a member of the DES team based at Duke University. Over five years, their telescope in the Chilean Andes snapped high-resolution photographs of 12% of the sky, creating the most extensive catalog of supernovas to date and locating the same spherical shells traced out by many millions of galaxies (albeit with less precision than DESI). So DESI would have to be picking up on the subtle influence of some additional, undiscovered field that acts as a gradually thinning repulsive fluid — one layered on top of, and barely distinguishable from, the constant vacuum energy.
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