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They manage to measure dark matter from almost the beginning of the universe

The traditional theories of cosmologydefined largely by Einstein’s general theory of relativity, might not also apply to the earliest era of our universe. Dark matter distorts the space around it for scientists trying to observe a galaxy, because when light travels through dark matter it bends, changing the galaxy’s apparent shape and distorting both space and time, just as as Einstein predicted in his general theory of relativity.

“Most researchers use source galaxies to measure the distribution of dark matter from the present to eight billion years ago,” Associate Professor Yuichi Harikane, of the Cosmic Ray Research Institute of Tokyo, explained in a news release. the University of Tokyo.

“However, we were able look further back in the past because we use the WBC, (cosmic microwave background for its acronym in English), more distant to measure the dark matter. For the first time, we measured dark matter from almost the earliest moments of the universe,” Harikane said.

The existence of dark matter, originally known as the “lost mass”was first deduced by the Swiss-American astronomer Fritz Zwicky, who in 1933 found that the mass of all the stars in the Coma cluster of galaxies provided only about 1 percent of the mass needed to prevent the galaxies from escaping. the gravitational pull of the cluster.

“12 billion years ago, things were very different. You see more galaxies forming than today; the first galaxy clusters are also beginning to form.” Galaxy clusters comprise between 100 and 1,000 galaxies held together by gravity with large amounts of dark matter. “I am glad that we have opened a new window to that time,” Miyatake said in the press release.

Seeing something that happened so long ago is hard. Due to the finite speed of light, distant galaxies do not appear as they are today, but as they were billions of years ago. But even more difficult is to observe dark matter, which does not emit light.

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