The DESI experiment was designed to measure the apparent size of cosmic structures through precise distance metrics to galaxies and quasars over 11 billion years. Its recent results indicated subtle deviations suggesting a potential weakening of dark energy, with confidence levels around 2.6-sigma when combined with cosmic microwave background data. Collaboration with other datasets is crucial for consistency in understanding universe expansion and matter density, as highlighted by DESI's co-spokesperson, Will Percival, emphasizing the need for unified parameters across different cosmological experiments.
That's what DESI was designed to do: take precise measurements of the apparent size of these bubbles (both near and far) by determining the distances to galaxies and quasars over 11 billion years.
Essentially, those differences suggested that the dark energy might be getting weaker. In terms of confidence, the results amounted to a 2.6-sigma level for the DESI's data combined with CMB datasets.
It's important to combine the DESI data with other independent measurements because "we want consistency," said DESI co-spokesperson Will Percival.
All of the different experiments should give us the same answer to how much matter there is in the universe at present day, how fast the universe is expanding.
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