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11-Sigma Detection of Dark Energy Comes From Measuring Over a Million Extremely Distant Galaxies

Posted: April 30th, 2021, 1:21 pm
by fred8615
After galaxies began to form in the early universe, the universe continued to expand. The gravitational attraction between galaxies worked to pull galaxies together into superclusters, while dark energy and its resulting cosmic expansion worked to drive these clusters apart. As a result, the universe is filled with tight clusters of galaxies separated by vast voids of mostly empty space.

The scale of these clusters and voids is based upon the rate at which the universe has expanded over time. The effect is similar to the way air molecules are clustered together by the varying pressure of sound waves, so the effect is known as baryon acoustic oscillation (BAO). Through this effect, astronomers can study dark energy by measuring the position and redshift of more than a million galaxies. Gathering and analyzing galaxies was first done by the Baryon Oscillation Spectroscopic Survey (BOSS). It was then extended to eBOSS, which has released its first results.

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