Breaking a 50-Year Law: New Evidence Challenges Fundamental Black Hole Physics

...The universality of the UV-to-X-ray relation underpins certain methods that use quasars as “standard candles” to measure the geometry of the universe and ultimately probe the nature of dark matter and dark energy. This new result highlights the necessity for caution, demonstrating that the assumption of unchanging black hole structure across cosmic time must be rigorously re-examined...