Evidence grows that dark energy changes over time

This is what Desi was designed to do: take precise measurements of the apparent size of these bubbles (near both near and far) by setting distances to galaxies and parallels over 11 billion years. This data can then be cut into parts to determine how quickly the universe expands at each point in the past, the better it is better to design how dark energy affects this expansion.

Ascending trend

Last year’s results were based on data analysis for a full year taken from seven different segments of the cosmic time and includes 450,000 parallels, the largest of which was ever collected, with record accuracy of the most distant era (between 8 to 11 billion years) from 0.82 percent. While there was a basic agreement with the Lamba CDM model, when the results of the first year were combined with data from other studies (including radiation of the cosmic microwave background and Supernovae), some accurate differences appeared.

Basically, these differences suggested that dark energy may increase weaker. Regarding confidence, the results reached 2.6-Sigma DESI data with CMB data collections. When adding Supernovae data, these numbers grew to 2.5-Sigma, 3.5-Sigma, or 3.9-Sigma, depending on a specific Supernova data set.

It is important to combine DESI data with other independent measurements because “we want consistency,” said the co -co -co -at Waterloo University. “All different experiences must give us the same answer to the importance of the universe at the present time, and the extent of the speed of the universe’s expansion. It is not good that all experiences agree with the Lambda-CDM model, but then it gives you different parameters. This does not work. For the basic characteristics of this model.”

These last results cover the first three years of the collected data, which extend to approximately 15 million galaxy and longing. Again, Desi data alone was consistent with Lambda CDM, that is, dark energy is fixed. Once again, when they are combined with other data groups – from CMB, super -floor, weak gravitational lens studies – increasing hints have emerged that dark energy may change over time. The confidence level ranges from 2.8 to 4.2 cm, depending on a mixture of data groups-shy only from the five threshold and prosecution.

This ordinary citizen may strike as an additional progress, but the reality is more complicated. “Desi data itself is not gradual,” said Perseval. “We now have three years of data instead of one year of data. This is a big thing, not only because of the increase in the area but because we have increased.