David Wallace

speaker

1,940 appearances 2 recordings 1 series first heard May 2025 last heard 20 Jul

David Wallace’s voice in public audio — every appearance, attributed to the second.

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Recordings per month over the last 12 months — 1 in all, peaking in Jul 2026 with 1.

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Theories of Everything with Curt Jaimungal · David Wallace: Why Many Worlds Is the Only Consistent Interpretation · 29 May 2025 podcast

Uh, and I think it's probably how I talk about it in that ancient paper of mine.

I think that's largely wrong.

Uh and in papers I'd be more willing to defend now, I've argued why I think it's wrong.

The reason I say it's wrong is because um well, there's a couple of things wrong with it.

The first thing is it assumes that we don't already have theories that combine quantum mechanics and gravity.

Uh and we do, very well tested theories.

If if I if you just drop your pen and it falls on the ground and stops

then uh you need both quantum mechanics and gravity to explain that.

Um, gravity to explain why it started falling in the first place, quantum mechanics explain why it stopped.

If you want to understand the structure of a white dwarf star or neutron star, which are both understood reasonably well, you need both gravity and quantum mechanics.

Nuclear fusion requires us to think in terms of gravity you know inside stars, think about gravity and quantum mechanics.

So we do I can have lots of examples of gravity and quantum mechanics together.

What's really going on in modern terms is that's because we don't have much trouble doing quantum theory of gravity, provided we keep away from energies that are.

the close sort of Planck energy, the sort of breakdown energy of German relativity in in this setup.

And so the re I think the right way to think about quantum gravity is that we're looking for

in particle physics terms, the ultraviolet completion of the low energy theories of quantum gravity we already have.

And I think those theories

while we don't understand them nearly as well as, say, quantum electrodynamics, are things we understand reasonably well, certainly well enough to calculate with.

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