Cosmic Expansion Gap Grows: Dark Energy May Be Evolving
Two long-standing methods for measuring the universe’s expansion—early-universe data from Planck and local observations of supernovae—remain at odds, a discrepancy known as the Hubble tension. New DESI results, when combined with other probes, hint that dark energy might not be a constant after all, challenging the simplest ΛCDM model. Riess and Leauthaud have warned that the standard cosmology could be cracking, even as some newer analyses (e.g., Lyman-alpha forest data) either align with or complicate this evolving picture. The cosmos’ expansion history thus remains an active, debated frontier.
