Science, Space and Technology News 2024
The DESI collaboration is conducting a groundbreaking experiment to understand the universe’s expansion and acceleration. Their work with the DESI instrument has enabled them to map the cosmos from its early stages to the present, challenging existing models of the universe. Initial findings suggest there may be more to discover about dark energy and cosmic acceleration.
The analysis of DESI’s first year of data collection confirmed the basics of what scientists hold as the best model of the universe, but it also hints that there is more to learn about the underlying cause, or causes, of cosmic acceleration, the discovery of which led to the “Gravity pulls matter together, so that when we throw a ball in the air, the Earth’s gravity pulls it down toward the planet,” Ishak-Boushaki said. “But at the largest scales, the universe acts differently. It’s acting like there is something repulsive pushing the universe apart and accelerating its expansion. This is a big mystery, and we are investigating it on several fronts.
This animation shows how baryon acoustic oscillations act as a cosmic ruler for measuring the expansion of the universe. Credit: Claire Lamman/DESI collaboration and Jenny Nuss/Berkeley Lab More data will also improve DESI’s other early results, which weigh in on the Hubble constant – a measure of how fast the universe is expanding today – and the mass of particles called neutrinos.DESI is the first spectroscopic experiment to perform a fully blinded analysis, which conceals the true result from the scientists to avoid any subconscious confirmation bias. Researchers work “blind” with modified data and write computer code to analyze their findings.
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