JB Manchak: Time Travel in Physics and What We Still Don't Know

Theories of Everything with Curt Jaimungal

Curt Jaimungal

Physics, Philosophy, Society & Culture, Science

4.6 • 606 Ratings

🗓️ 16 March 2026

⏱️ 140 minutes

🔗️ Recording | iTunes | RSS

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Summary

I personally subscribe to The Economist. TOE listeners get 35% off the annual subscription. No other podcast has this! https://economist.com/TOE Curt Jaimungal examines why physicists still can't resolve whether time travel is possible or forbidden.What if you gathered every possible piece of evidence about the universe — every observation, past, present, and future — and it still wasn't enough? That's not a philosophical parlor trick. It's a theorem. J.B. Manchak proves it using the very tools of general relativity, and then connects it to Zen Buddhism's teaching on the self. This one is a quiet storm. TIMESTAMPS: - 00:00:00 - Unknowability of the Universe - 00:05:14 - Space-Time Maximality Metaphysics - 00:11:02 - Time Travel in GR - 00:16:53 - Causal Structure and Topology - 00:24:01 - Cauchy Surfaces and Determinism - 00:32:13 - Solving the Halting Problem - 00:47:38 - Cosmic Censorship Hypothesis - 00:56:58 - The God Point Theorem - 01:02:16 - Global Structure Underdetermination - 01:11:21 - Heraclitus Space-Times Defined - 01:24:22 - Hierarchy of Classical Space-Times - 01:33:08 - The Universe Puzzle Analogy - 01:40:51 - Underdetermination of the Self - 01:51:39 - Zen Buddhism and Non-Self - 02:00:57 - Repeatability and Heraclitus - 02:06:41 - The Power of Slow Thinking Theories of Everything with Curt Jaimungal features long-form, technically detailed interviews with leading researchers in physics, mathematics, consciousness, and philosophy, exploring topics at the level of active research. For academics, graduate students, and anyone seeking depth beyond popular science. FOLLOW: Substack | Spotify | YouTube | Twitter Learn more about your ad choices. Visit megaphone.fm/adchoices Learn more about your ad choices. Visit megaphone.fm/adchoices

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1:19.1	Some of them might allow for time travel.
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