The enigma surrounding dark energy has grown more complex
The Dark Energy Spectroscopic Instrument (DESI), an international project involving over 900 researchers, is shedding new light on one of the universe's most mysterious phenomena - dark energy. This latest development could have profound implications for the ultimate fate of the universe.
Observable matter makes up just 5% of the cosmos, while dark energy, responsible for a whopping 68%, remains elusive. The new DESI data suggests dark energy may not be constant over time, potentially causing the universe's expansion to accelerate or leading to an inward collapse.
If dark energy is indeed changing, it would challenge the predominant model of the universe, Lambda-CDM, which assumes dark energy as a constant. Rossana Ruggeri, a physicist at the University of Queensland, stated that the latest DESI data suggests dark energy might not behave like a simple cosmological constant.
The second batch of data from DESI has made this evidence stronger, though it does not yet meet the statistical threshold for a firm discovery. The team currently investigating the variability of dark energy includes researchers at the Ludwig Maximilian University of Munich (LMU) and the Max Planck Institute for Extraterrestrial Physics (MPE), who work with data from projects such as the Dark Energy Survey and the ESA Euclid space telescope.
Leading scientists involved in this research are associated with these institutions, including Dr. Frank Grupp (instrument development for Euclid) and Prof. Dr. Paola Caselli at MPE, recognised for their astrochemical and astrophysical research.
The second data release from DESI contains information about 18.7 million objects deep in space, including distances to extremely remote galaxies, covering 11 billion years of the universe's history. DESI's first data release is just a fraction of what's to come from its five-year survey of the cosmos.
The DESI project has collected more than twice as many unique objects outside of the Milky Way than in all previous 3D spectroscopic surveys combined. The instrument can collect data on more than 100,000 objects in a single night from its perch atop the National Science Foundation's Nicholas U. Mayall 4-meter telescope.
The rapid advance of the DESI project is powered by the clever combination of improved instrument designs, technologies, and analysis of ever-fainter galaxies. The data release from DESI is free and available for public access, and some of the instrument's data can be explored via the Legacy Survey Sky Browser.
DESI has already produced gargantuan sky maps and helped reveal some of the universe's largest structures, including the source of the universe's largest known jets. As the project continues, it promises to unveil more secrets about the cosmos and our place within it. The latest findings from DESI were revealed at the American Physical Society's Global Physics Summit and are hosted in several papers posted to the preprint server arXiv. The DESI project's latest release challenges the foundational understanding of dark energy and its role in the universe.
