J.B. Manchak
Professor of philosophy of physics at UC Irvine known for rigorous theorems about general relativity, unknowability of global space-time structure, time travel possibilities, and the introduction of Heraclitus space-times.
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Mar 16, 2026 • 2h 18min
JB Manchak: Time Travel in Physics and What We Still Don't Know
J.B. Manchak, a UC Irvine philosopher of physics known for rigorous theorems about general relativity and time travel, explores why even complete local data can leave the universe globally unknowable. He discusses closed timelike curves, Cauchy surfaces and determinism, Malament–Hogarth spacetimes and computability, Heraclitus space-times, and connections between cosmic underdetermination and ideas about the self.
