DESI Findings Challenge Dark Energy at w=-1 as Scientists Test Phantom-Divide Crossing
Updated
Updated · Moneycontrol · Jun 20
DESI Findings Challenge Dark Energy at w=-1 as Scientists Test Phantom-Divide Crossing
2 articles · Updated · Moneycontrol · Jun 20
Summary
DESI-driven analyses are pushing cosmologists to test whether dark energy changes over time and may have crossed the phantom divide, rather than staying fixed as Einstein’s cosmological constant.
At the center is w, the dark-energy equation-of-state parameter: in the standard ΛCDM model it equals -1, and any move above or below that line would signal evolving dark energy.
Two quintessence-based scenarios—one with higher-order kinetic effects, another linking dark matter and dark energy—both matched DESI observational trends better than the conventional model while allowing that crossing.
The evidence is still short of a discovery, and the proposed models require fine-tuned parameters while some versions struggle to fit conditions in the early universe.
DESI’s expanding 3D map of millions of galaxies and quasars could determine whether the apparent deviation is real, with implications for the universe’s long-term evolution.
Is a mysterious force interacting with dark matter, changing the fate of our cosmos?
Is our universe headed for a violent 'Big Rip' instead of a quiet heat death?
DESI Data Suggests Dark Energy Is Weakening: Implications for the Fate of the Universe and the ΛCDM Model
Overview
On March 19, 2025, the DESI collaboration announced groundbreaking findings that challenge the standard view of the universe’s expansion. By analyzing an unprecedented amount of data from millions of galaxies, DESI created the largest 3D map of the universe. This vast dataset was combined with results from other major cosmological studies, such as the cosmic microwave background, supernovae, and weak gravitational lensing. Together, these efforts suggest that dark energy—the force driving cosmic expansion—might be weakening over time, rather than remaining constant. This discovery could profoundly reshape our understanding of the universe’s evolution and its ultimate fate.