Dark energy—the cosmic constituent causing the expansion of the Universe to accelerate—is changing with time, according to results announced last week at the American Physical Society’s Global Physics Summit in Anaheim, California. These findings, which call into question the conventional model of cosmology known as ΛCDM, come from measurements by the Dark Energy Spectroscopy Instrument (DESI) of the distances and spectra of millions of galaxies and quasars, the largest dataset of its kind. The researchers are more confident now than they were last year when making similar but more cautious claims. The proposed time-evolving dark energy would have implications for the fate of the Universe and for theories that attempt to unify gravity with quantum mechanics.
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