This is what designs were designed: to make precise measurements of the apparent size of these bubbles (both near and distant), determining the distances from the galaxy and quasars within 11 billion years. These data can then be cut into pieces to determine how quickly the universe has expanded at all times in the past, the better to model, how gloomy energy affects this extension.
Upward trend
The results of last year were based on the analysis of the full year of data collected from seven different pieces of cosmic time and cover 450,000 quasars, the largest collected, with record precision of the most distant era (from 8 to 11 billion years ago) 0.82 percent. Although there was basic compliance with the Lamba CDM model, when these first year’s results were combined with data from other studies (including microwave and supernova space radiation), some subtle differences appeared.
Basically, these differences suggest that gloomy energy may weaken. In terms of trust, the results amounted to the level of 2.6-sigma for DES data in combination with CMB data sets. When adding supernova, these numbers increased to 2.5-sigma levels, 3.5-sigma or 3.9-sigma, depending on which specific set of Supernova data.
It is critical to combine Desi data with other independent measurements, because “we want consistency,” said Des-Spokesperson Percival from the University of Waterloo. “All different experiments should give us the same answer to how many things are currently in the universe, how quickly the universe is widely expanded. It is not good if all experiments agree with the Lambda-CDM model, but then gives you other parameters. It simply does not work. Saying that it is consistent with lambda-CDM, it is not enough.
These latest results include the first three years of collected data, covering almost 15 million galaxies and quasars. Once again, the Desi data themselves was in line with the LAMBDA CDM, i.e. dark energy is constant. And once again in combination with other data sets – with CMB, supernova and weak tests of gravitational lenses – there were tips that dark energy can change over time. The confidence level is from 2.8 to 4.2 Sigma, depending on the combination of data sets-just shame compared to the threshold of five Sigma.
This may hit the average citizen as incremental progress, but reality is more complicated. “Desi’s data themselves are not incremental,” Percival said. “We now have three years of data, not a year of data. This is significant, not only because of the increased area, but because we have increased the overlap. The way we conduct the survey is to build discs in the sky, and after three years, and not by one year of operation, we have much more to take place. The measurements themselves are much better.