One of the great intellectual achievements of the twentieth century was the theory of quantum mechanics, according to which observational results can only be predicted probabilistically rather than with certainty.

Yet, after decades in which the theory has been successfully used on an everyday basis, most physicists would agree that we still don’t truly understand what it means. Sean Carroll will talk about the source of this puzzlement, and explain why an increasing number of physicists are led to an apparently astonishing conclusion: that the world we experience is constantly branching into different versions, representing the different possible outcome of quantum measurements. This could have important consequences for quantum gravity and the emergence of spacetime.


Sean Carroll is a theoretical physicist at the California Institute of Technology, and an External Professor at the Santa Fe Institute. He is the host of the weekly Mindscape podcast. He is the author of several books, most recently Something Deeply Hidden: Quantum Worlds and the Emergence of Spacetime.

This talk is part of the Darwin College Lecture Series.


If you have a question about this talk, please contact Janet Gibson.