Researchers can 'clearly see features of this invisible world that are hundreds of millions of light-years across.'
, which was produced using data from the Dark Energy Survey and the South Pole Telescope. That map upheld previous estimations of the ratio of ordinary matter to dark matter and found that the distribution of the matter was less clumpy than previously thought.The new map homes in on a lingering concern of Einstein’s general relativity: how the most massive objects in the universe, like supermassive black holes, bend light from more distant sources.
The researchers effectively used the background as a backlight, to illuminate regions of greater density in the universe.“It’s a bit like silhouetting, but instead of just having black in the silhouette, you have texture and lumps of dark matter, as if the light were streaming through a fabric curtain that had lots of knots and bumps in it,” said Suzanne Staggs, director of the Atacama Cosmology Telescope and a physicist at Princeton, in the university release.
The recent analysis suggests that the dark matter was lumpy enough to fit with the standard model of cosmology, which relies on Einstein’s theory of gravity.Eric Baxter, an astronomer at the University of Hawai’i and a co-author of the research that resulted in the February dark matter map, told Gizmodo in an email that his team’s map was sensitive to low-redshifts .
“Said another way, our measurements and the new ACT measurements are probing somewhat different aspects of the matter distribution,” Baxter said. “Thus, rather than contradicting our previous results, the new results may be providing an important new piece of the puzzle about possible discrepancies with our standard cosmological model.
New instruments should help tease out the matter distribution of the universe. An upcoming telescope at the Simons Observatory in the Atacama is set to begin operations in 2024 and will map the sky nearly 10 times faster than the Atacama Cosmology Telescope, according to the
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