Dr. Sean Carroll -- The Paradoxes of Time Travel

[vimeo] Dr. Sean Carroll talks bout how time travel would possibly work in the context of Einstein's theory of general relativity, including the hypothetical idea of wormholes connecting distant regions of space. Dr. Carroll also explores the logical structure of time travel, and what it implies about predestination and free will. In the end, time travel is probably not possible, but by taking the idea seriously we help understand how the universe works.

Sean Carroll studies the structure and evolution of the universe in his quest to learn about its fundamental physics. His interests these days are on inflation, the arrow of time, and what happened at or before the Big Bang. His research involves dark matter and dark energy, modified gravity, topological defects, extra dimensions, and violations of fundamental symmetries. Dr. Carroll is a Senior Research Associate in Physics at the California Institute of Technology where he investigates the theoretical aspects of cosmology, field theory, and gravitation. His most recent book is "From Eternity to Here: The Quest for the Ultimate Theory of Time", a popular book on cosmology and the arrow of time and is a contributor to the blog Cosmic Variance. He received a B.S. in astronomy and astrophysics from Villanova University and a Ph.D. in astronomy from Harvard University.

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