David Wallace: Why Many Worlds Is the Only Consistent Interpretation

Theories of Everything with Curt Jaimungal

Curt Jaimungal

Physics, Philosophy, Society & Culture, Science

4.6 • 606 Ratings

🗓️ 29 May 2025

⏱️ 133 minutes

🔗️ Recording | iTunes | RSS

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Summary

Philosopher of physics David Wallace unpacks the Everett (Many‑Worlds) interpretation, tackling common misconceptions, probability, emergence and personal identity across multiple worlds.0:00 Misconceptions About Physics1:27 Simplicity in Physics4:48 Understanding Quantum Mechanics7:27 Mysteries of Large-Scale Physics9:53 The Nature of Time13:19 Boundary Conditions in Physics15:04 Models of Physics16:56 Canonical vs Covariant Quantization21:10 Theories of Gravity28:22 Everettian Quantum Mechanics30:11 Misconceptions in Many Worlds Theory47:52 Decision Theory in Quantum Mechanics57:58 The Deutsch-Wallace Theorem1:14:47 The Nature of Fundamental Physics1:18:40 Personal Identity in Many Worlds1:27:14 Exploring Emergence1:33:19 Thoughts on Consciousness1:35:09 Disagreements with David Deutsch1:39:18 Understanding Real Patterns1:54:02 The Relevance-Limiting Thesis2:00:54 Advice for Young ResearchersSPONSORS:- Huel: 15% OFF + Free Gift with code theoriesofeverything - https://huel.com/theoriesofeverything- I personally subscribe to The Economist. TOE listeners get 35% off the annual subscription. No other podcast has this! https://economist.com/TOERESOURCES:- The Emergent Multiverse (book): https://www.amazon.com/dp/0198707541- David Wallace’s published papers: https://philpeople.org/profiles/david-wallace/publications- Stating Structural Realism (paper): https://philsci-archive.pitt.edu/20048/1/semantic.pdf- David’s reading resources: https://sites.pitt.edu/~dmw121/resources.html- The Quantization of Gravity (paper): https://arxiv.org/pdf/gr-qc/0004005- Ted Jacobson discusses entropy on TOE: https://www.youtube.com/watch?v=3mhctWlXyV8- Curt debunks the "all possible paths" myth: https://www.youtube.com/watch?v=XcY3ZtgYis0- Julian Barbour discusses time on TOE: https://www.youtube.com/watch?v=q-bImnQ9cmw- TOE’s String Theory Iceberg: https://www.youtube.com/watch?v=X4PdPnQuwjY- Bryce DeWitt’s published papers: https://journals.aps.org/search/results?clauses=%5B%7B%22operator%22%3A%22AND%22%2C%22field%22%3A%22author%22%2C%22value%22%3A%22Bryce+S+DeWitt%22%7D%5D- Carlo Rovelli discusses loop quantum gravity on TOE: https://www.youtube.com/watch?v=hF4SAketEHY- Avshalom Elitzur discusses spacetime on TOE: https://www.youtube.com/watch?v=pWRAaimQT1E- Sean Carroll discusses the physics community on TOE: https://www.youtube.com/watch?v=9AoRxtYZrZo- Ruth Kastner discusses retrocausality on TOE: https://www.youtube.com/watch?v=-BsHh3_vCMQ- Simon Saunders's talk on Many Worlds: https://www.youtube.com/watch?v=9gM-sgmCUik- Jacob Barandes discusses quantum mechanics on TOE: https://www.youtube.com/watch?v=7oWip00iXbo- Jacob Barandes discusses philosophy in physics on TOE: https://www.youtube.com/watch?v=YaS1usLeXQM- Join My New Substack (Personal Writings): https://curtjaimungal.substack.com- Listen on Spotify: https://open.spotify.com/show/4gL14b92xAErofYQA7bU4e- Become a YouTube Member (Early Access Videos): https://www.youtube.com/channel/UCdWIQh9DGG6uhJk8eyIFl1w/join- Support me on Patreon: https://patreon.com/curtjaimungal- Support me on Crypto: https://commerce.coinbase.com/checkout/de803625-87d3-4300-ab6d-85d4258834a9- Support me on PayPal: https://www.paypal.com/donate?hosted_button_id=XUBHNMFXUX5S4 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. Learn more about your ad choices. Visit megaphone.fm/adchoices Learn more about your ad choices. Visit megaphone.fm/adchoices

Transcript

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0:00.0	It's weird, it's alien, super unintuitive, but the systems physicist study are really simple systems.
0:07.0	There's a really wide-fed misconception that physics is complicated.
0:12.2	Professor David Wallace of the University of Pittsburgh is one of the world's top philosophers of physics
0:17.9	who targets simplicity, seen through the lens of the Everettian interpretation
0:21.7	of quantum mechanics, which is commonly known as the many-world's theory. Today, we explore this
0:27.6	theory in-depth, dispelling common misinterpretations, and tackling questions like, how do you
0:32.6	gain empirical warrant for the born rule itself, the probabilities of quantum mechanics, when you're confined
0:37.9	to a single branch. We later explore what Wallace calls the greatest mystery in physics, that is,
0:44.3	why microscopic physics treats past and future identically, however, our macroscopic reality
0:49.3	experiences them as fundamentally different. We then explore other probability problems in many worlds,
0:55.2	like if all possibilities occur, then how do probabilities make sense? This is where Wallace's
1:00.2	decision-theoretic approach gets explained. Finally, we investigate Wallace's conception of reality
1:06.0	itself, how emergent patterns at different scales can be considered equally real despite emerging from
1:12.5	something else. This is where emergence gets explained, and Wallace shows that the best understanding
1:18.6	comes from not abandoning math for pure philosophy, nor from shutting up and calculating,
1:24.4	but from their thoughtful integration together.
1:28.5	What's the largest misconception in physics that you have to dispel to even other physicists?
1:34.4	So there's a bunch of things I could try, but let's try this. There's a really wide
1:40.8	misconception that physics is complicated.
1:50.8	And physics is, in a certain sense, very simple compared to other sciences.
1:52.0	It's weird.
1:53.1	It's alien.
	...

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