
Cosmology on the Brink: Subtle Clues That the Universe Isn’t Uniform
Physicists tested a cornerstone of modern cosmology — that the universe is uniform on large scales (FLRW cosmology) — using new diagnostic tests and data from Pantheon+ supernovae, DESI, and baryon acoustic oscillations. They found mild but intriguing deviations (about 2–4 sigma) from standard FLRW predictions, which could point to light propagating through underdense regions (Dyer–Roeder effect) or to the impact of cosmic structure growth (backreaction). The results are preliminary and highly dataset-dependent, so more precise observations are needed to confirm whether the standard cosmological model needs updating.





