Dark Energy May Be Weakening, Challenging Core Physics Theories

Recent astronomical observations suggest that dark energy—the mysterious force driving the accelerated expansion of the universe—may not be constant, a revelation that could reshape the foundations of modern physics.

An international research team conducted a three-year observational study using the Dark Energy Spectroscopic Instrument (DESI), analyzing data from 15 million galaxies. Their findings indicate that dark energy, long assumed to be unchanging, may be gradually weakening. This challenges the prevailing "cosmological constant" theory, which posits that dark energy is a fixed force sustaining the universe's expansion.

By integrating data from multiple observational sources—including cosmic microwave background radiation, supernova explosions, and gravitational lensing—the researchers found statistical evidence for dark energy variation at a significance level between 2.8 and 4.2 sigma. Although it falls short of the 5-sigma threshold required for definitive confirmation in physics, a 4.2-sigma significance level is already approaching a groundbreaking discovery.

If confirmed, this finding would necessitate a fundamental revision of cosmological theories explaining the universe's evolution. As one of the most advanced astronomical survey projects, DESI can simultaneously capture the spectral data of 5,000 galaxies and ultimately aims to observe 50 million celestial objects.