Physicists Identify Potential Flaws in Century-Old Cosmological Model

A trio of preprint papers suggests that the universe may not be perfectly uniform on the largest scales, challenging a core assumption of standard cosmology known as Friedmann-Lemaitre-Robertson-Walker (FLRW) geometry. By combining observations of distant supernovae and large-scale galaxy surveys, researchers identified tentative deviations with a statistical significance of 2 to 4 sigma. While this falls short of the 5-sigma threshold required for a definitive discovery in physics, the findings hint at new physics beyond the standard model. Study co-author Asta Heinesen noted a surprising violation of FLRW curvature consistency, suggesting that space's curvature might not be uniform everywhere. The research highlights the ability to directly measure Dyer-Roeder and backreaction effects, distinguishing them from other theories like evolving dark energy or modified gravity. If confirmed, these deviations could rule out many current solutions to cosmological tensions. The team emphasizes that further research using larger and more precise datasets is necessary to validate these empirical violations and constrain the observed effects, potentially reshaping our understanding of the universe's geometry and expansion.