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For most of modern cosmology, scientists have worked with a surprisingly simple assumption: the mysterious force driving the universe's accelerating expansion has remained unchanged throughout cosmic history. Known as dark energy, this invisible component is thought to make up nearly 70 per cent of the cosmos, yet its true nature remains one of science's greatest unsolved puzzles.Now, a new theoretical study inspired by recent observations from the Dark Energy Spectroscopic Instrument (DESI) is exploring a provocative possibility. |