Brian Greene Sean Carroll Jun 2026

Because their debate is a microcosm of a crisis in physics. For 50 years, we have made no major experimental breakthroughs beyond the Higgs boson. String theory has not made a single testable prediction. The Many-Worlds interpretation is unfalsifiable. Both Greene and Carroll are navigating the same storm:

Sean Carroll, a research professor at Caltech and Johns Hopkins, is equally influential but approaches the "theory of everything" from a different angle. He is one of the most prominent defenders of the Many-Worlds Interpretation (MWI) of quantum mechanics. In his book Something Deeply Hidden , Carroll argues that the world doesn't "collapse" into a single reality when we observe it; instead, it splits into multiple, parallel timelines where every possible outcome occurs. Competing Visions: String Theory vs. Many-Worlds brian greene sean carroll