The Multiverse is REAL - David Deutsch

- VIDEO NOTES

David Deutsch is a British physicist at the University of Oxford. He is a visiting professor in the Department of Atomic and Laser Physics at the Centre for Quantum Computation in the Clarendon Laboratory of the University of Oxford. (Wikipedia.)

- LINKS

- TIMESTAMPS

00:00 Confidence in the Existence of a Multiverse
05:05 Why People Don’t Agree With David’s View
09:52 How Quantum Mechanics Leads to This Conclusion
20:09 How Science Reacted to the Puzzling Experiment Results
32:14 Why Other Explanations Were Insufficient
40:47 How a Wave Function Test Translates Into a Multiverse
43:47 Visualising the Multiverse
53:21 Is David’s Claim Revolutionary or Obvious?
57:15 Are We Far Off From Quantum Computers?
1:06:30 Philosophical Implications of a Multiverse
1:11:41 Quantum Probability
1:16:39 Does the Multiverse Theory Get Rid of Consequentialism?
1:27:45 How Many Different Universes Are in the Multiverse?

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Alex O'Connor
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[jozefcyran]

Came here from the universe where Mr. Deutsch got riled up at the question about copenhagen interpretation, accused Connor of inviting him under false pretenses and stormed off. Good thing Alex was able to discuss that event with his longstanding friend and idol, Peter Hitchens

[thestormthatisapproaching]

Might sound odd, but the way this guy is always so articulate while having discussions is almost therapeutic, or at the very least satisfying.

[fortyyearfitness]

The worse the haircut the smarter the man

[DaveMuller]

I'm not sure how your videos keep getting better like this. By far the best interview I've heard from him because of how you let him speak and asked questions that don't normally get aired.

[jamesalfredburchiii]

The simplest explanation of the double slit experiment is that our current methods of measurement must be having some effect on the OUTCOME of the MEASUREMENT itself, NOT that there *must* be an invisible other world(s) in which the measurements were different. Any explanation not rooted in the rational and measurable world is spiritual speculation, not science. Folks have the right to believe in whatever they want, but you can’t claim your views are authoritative if they aren’t.

[desert_sky_guy]

💗💗💗💗 This was the best 90 minutes of media consumption I've made in a while. "Beginning of Infinity" is my favorite book of all time. It is a good explanation of how things are, you might say. Genuinely geeked to watch you two have this conversation, thank you so much for doing this!

[ScienceAppliedForGood]

It was an interesting interview. Thanks for inviting David.

[johnzhou]

Alex: the *Cope* nhagen interpreation.
David: nice.

[BaskerElli]

This is one of my favourite episodes so far. I liked how you rearticulated each point in a way that a person without much scientific background could understand it. Super interesting! If I may point out one thing to improve, it would be adding visuals of some kind to support and clarify the content in the more technical parts of the interview. But overall I really enjoyed this episode. Can't wait to see what comes next!

[Eudaletism]

Here's an analogy. Imagine you saw some water on the road, and hypothesized that it was a puddle. Later you calculated that, given atmospheric conditions, there should be a mirage of water right in that spot. Now you have two interpretations of what you're seeing: it could be a mirage, or it could be a real puddle with a mirage on top. The latter double-explains the observation. The real puddle idea, even though it came first, is now a floating postulate that doesn't explain anything not already explained by everything else. It can be removed without changing what you see.

MWI is the _simplest_ model of QM that agrees with the observations. You can propose hypothetical new physics principles that trim the worlds, but the underlying mathematical scaffolding for producing them will still be there, and since the added principles are motivated by aesthetics rather than observation, there is technically no evidence for them. Also, since they are set up so that there's no way to test whether they are true, they are unfalsifiable as well. You don't need a collapse postulate, for example, because the _appearance_ of collapse is already explained by the wave equation operating on the particles within the observer. Introducing new physics to explain the observation of collapse in a second way is like adding a real puddle on top of that mirage.

[PrettyLittle_Piss]

I first heard of this man when trying to understand dimensions. People kept referring to his description of the multi worlds interpretation. To watch you going from a kid in college, to talking to Dawkins to Deutsch, is such an incredible full circle for me. Always appreciated your videos. :)

[cheoresono]

Mind blowing! Thanks Alex for giving us the opportunity to listen to David!

[Infideles]

What I get from Deutsch's views is that existence itself is eternal and infinite, and plays out in infinite manners. Which leads us to the inescapable conclusion that EVERY potential universe not only eventually comes into existence, but does so infinite times. We exist as who we are in infinite universes, and in every possible permutation in other universes. However, unless we can actually connect and examine these other realities, they mean absolutely nothing to us.

[XOPOIIIO]

Just maximize the number of universes where you do good, and minimize the number of universes where you do bad. It's the same logic as with one universe.

[vinegarable]

Wow! This is one of the most interesting interviews I've ever listened to! I think I'll have to listen again a few times to understand it all.

[StratosJ]

Hello Alex. For the next time I'd like to suggest incorporating simple graphics to illustrate the experiments the guest describes. I'll admit personally I was getting lost at the photon/silver atom experiments already despite being somewhat familiar with them.

And I do hope there is a next time because any similar topic is very dear to me and I can't wait to see your takes on it.

[kylewollman]

The Beginning of Infinity is such a great book! It directly inspired me to go back to school and study computer science. It had a greater impact on me than any other single book. Thanks for another great interview!

[El_Diablo_]

Damn good stuff. David is the greatest physicist and philosopher of our era. Thanks for diving into the multiverse with him.

[flocksbyknight]

Excellent job redirecting his articulations on this complex topic. Stellar interview 🙏

[ral]

Consciousness is hardly mentioned. Can’t have ANY of this without awareness of, experience of. As Max Planck stated: “I regard consciousness as fundamental. I regard matter as derivative from consciousness. We cannot get behind consciousness. Everything that we talk about, everything that we regard as existing, postulates consciousness.”