Ep 208: David Deutsch’s ”The Fabric of Reality” Chapter 11 ”Time: The First Quantum Concept” Part 3
ToKCast
by Brett Hall
2w ago
Here we explore the distinction between classical notions of time (including spacetime physics) as approximations to how time is understood in the multiverse. How perfectly deterministic laws lead to subjective unpredictability. Consequences for free will, questions about what happened before time began (or after it ends), new discoveries since the publication of The Fabric of Reality was published in 1997 and David's subtle alterations to phrasing between The Fabric of Reality and The Beginning of Infinity (in particular with reference to identical vs fungible and how tossing "fair" coins in ..read more
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Ep 207: Variations on a Conjecture
ToKCast
by Brett Hall
1M ago
If you are distracted by, or simply prefer a version without, the background music - you can find that here: https://youtu.be/xSbqTTs1nl0   My preferred version is here: https://youtu.be/2IneL4VpShE as there are some helpful (though not essential) visuals. This is about knowledge creation and the the commonalities between the two forms known (evolution (by natural selection) and explanatory) and the differences between them. It teases out and synthesises some of the work of Darwin, Popper and Deutsch on these matters of what creativity means. I also consider the place of prediction and pr ..read more
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Ep 206: Sam Kuypers (Time: The First Quantum Concept Part 3 - and more).
ToKCast
by Brett Hall
2M ago
Sam Kuypers is a theoretical physicist who specialises in the physics of time. If you have the time, Sam can take up as much of it as you like telling you about how our ideas of time have changed…over time. As Sam will reveals: times, they are not a-changing. But there is change! Newtonian physics has a notion of time (or at least Newton himself did), Relativity as discovered by Einstein in the early 1900s radically transformed our notion of what time is and now, in the 21st Century, Sam Kuypers and others are beginning to develop a quantum theory of time. And this is why Sam joins me for this ..read more
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Ep 205: David Deutsch’s ”The Fabric of Reality” Chapter 11 ”Time: The First Quantum Concept” *Part 2*
ToKCast
by Brett Hall
3M ago
Part 2: Time is in the instant. The instant is not in time. More on the quantum theory of time and how the "spacetime" view of time, and the flow of time are false. How time relates to the "block universe" model and how the multiverse fixes the paradoxes at the heart of our common sense (and classical physics) ideas about time - more readings from "The Fabric of Reality" chapter 11 and in addition: A couple of acrostics about David Deutsch in terms of "Popper". David's changing view of free will. Readings on "free will" from "A Science of Can and Can't" by Chiara Marletto. A summary of a paper ..read more
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Ep 204: David Deutsch’s ”The Fabric of Reality” Chapter 11 ”Time: The First Quantum Concept” Part 1
ToKCast
by Brett Hall
4M ago
This is really "episode 0" but not quite because we do indeed get to some readings and unpackings of the chapter. But in the overall scheme, that forms a minor part of a longer introduction to the "common sense" understanding of time and then to some relativity (of simultaneity) and reflections on the work of other physicists and popularisers.   Note clips from "The Lord of the Rings" and "Spaceballs" movies are owned by their respective copyright holders ..read more
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Ep 202: David Deutsch’s ”The Fabric of Reality” Chapter 10 ”The Nature of Mathematics” Part 3
ToKCast
by Brett Hall
4M ago
The nature of proof and mathematics as a creative enterprise. Not all that is true can be proved as such, the high hopes of David Hilbert for placing the entirety of mathematics on a "firm foundation", the mathematical world-shattering results of Kurt Gödel which frustrated that project, a history of proof and finally Roger Penrose and whether human brains are computers in the Turing sense. And some very long remarks by me, especially in the introduction. Become a subscriber at https://patreon.com/tokcast?utm_medium=unknown&utm_source=join_link&utm_campaign=creatorshare_creator&utm ..read more
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Ep 201: Progress: Conserving the means of Error Correction. Free Speech, Free Trade and Democracy.
ToKCast
by Brett Hall
6M ago
Drawing on Chapter 15 "The Evolution of Culture" from "The Beginning of Infinity" by David Deutsch and then applying it to some special cases. Come and chat to me about this or anything else at https://www.getairchat.com/brett Timestamps: 00:00 Speech, Trade and Democracy 02:39 Is Democracy under attack? 07:05 Free Speech as Error Identification 09:14 Limits on Free Speech? 13:02 Case Study 1: North Korea 14:18 Case Study 2: Afghanistan and Iraq 17:30 Case Study 3: South Korea 19:43 Case Study 4: China 24:43 The Evolution of Culture by David Deutsch 1 29:43 Protecting liberty in Western Nation ..read more
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Ep 200: Chiara Marletto
ToKCast
by Brett Hall
7M ago
00:00 Introduction 08:03 Interview Begins 09:42 How Chiara found herself at the foundations of physics 15:30 How Chiara found Everett 19:13 No Special Physics is required for Observers 21:02 What is a counterfactual? How is it linked to a constructor? 29:05 What is (classical) information? How is it different to quantum information? 32:30 Quantum Information is more constrained. This makes it more powerful. 34:08 Is the universe made of information? 38:04 The Simulation Hypothesis 40:33 The second law of thermodynamics 53:16 The AI Apocalypse? 58:02 How do we help a human become passionate abo ..read more
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Ep 199: David Deutsch’s ”The Fabric of Reality” Chapter 10 ”The Nature of Mathematics” Part 2
ToKCast
by Brett Hall
9M ago
The certainty of mathematics and its place in the supposed hierarchy of subjects (assumed to be above science which is itself above philosophy in turn). Some more remarks on Bayesianism and somehow ghosts and alien life ..read more
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Ep 197: David Deutsch’s ”The Fabric of Reality” Chapter 10 ”The Nature of Mathematics” Part 1: Introduction
ToKCast
by Brett Hall
10M ago
This episode is an introduction to the chapter. Although there are some readings, they are limited and I provide context by diving deep into David's more recent work on all this. Specifically we go through the connection of Chapter 10 here (published in 1997) and Chapter 5 "The Reality of Abstractions" from "The Beginning of Infinity" (published in 2011) and then also in light of David's recent speech given at his Dirac Medal award ceremony (published in 2017) - here is the timestamped link to that https://www.youtube.com/live/J7HeDX_7... and the text of that speech is online here: https://www ..read more
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