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

If there's something which is, you know, is a dynamically permissible evolution according to the Schrdinger equation, but the actual quantum state is such that it gets exact absolute exactly zero, then it won't happen.

However, as a practical matter, it's quite difficult to come up with things like that.

Um so

Within those constraints, the space of things that happens is extremely permissive.

I mean, one way to think about it is that any sequence of outcomes from a series of quantum experiments, however unlucky, unlikely, is going to be seen.

So, you know, if I measure trillions of spin path particles, um there will be a branch in which I get spin up every single time.

Um, no, because individual eigenstates of position aren't a good choice for the um

the decoherent basis.

Uh I if I if I consider histories that def defined by fine grained positions, they're not going to decohere.

Um, if you want to find something that decoheres that actually shows this

not having any interference or negative interference, you're gonna have to cause grain a bit.

So the kind of plausible basis you might find you ma is you might say, okay, I'm gonna look at the

Firstly, I'm gonna look at not not not the position of every particle in my body, but the kind of coarse grained averages of positions of the particles in my body.

So I'll I'll look at my mass distribution averaged over cells or micron across or something.

And even then I'll

Uh I'm I'm interested in projectors of small but not zero

With

So I'm not I'm not considering a projector onto an exact

configuration of the of of of that coarse grained probabil a mass distribution, I'm asking for it

Up to some files.

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