Time Travel in Physics: “We Still Don't Know”

SPONSORS: - Sign up for Claude today at http://Claude.ai/theoriesofeverything and checkout Claude Pro — which includes access to all of the features mentioned in today's episode. - Let AI do the note-taking. Visit https://plaud.ai/toe and use code TOE for 10% off at checkout. - Go to https://shortform.com/toe for a free trial and an exclusive $50 OFF on your annual subscription. - Accelerate your efficiency. Sign up for your one-dollar-per-month trial today at http://shopify.com/theories. - As a listener of TOE you can get a special 35% off discount to The Economist and all it has to offer! Visit https://www.economist.com/toe 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 Learn more about your ad choices. Visit megaphone.fm/adchoices