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

I mean every well there's two things going on.

So firstly

If you have a sufficiently low amplitude branch, this goes back to what you're saying about is there no interference at all.

If you had a sufficiently low amplitude branch, then you could expect that it won't actually have a coherent

evolution, the the noise from interference um with other branches is gonna wash it out.

Um, you know, there's that that noise is extremely small and drops off extremely quickly, but it isn't zero.

So to take an example you often see in physics textbooks, if you ask like, you know, y y you you might you get you sometimes you you you might have to calculate what's what's my amplitude just to tunnel through the wall?

Um, you know, you can we c this is the I remember doing that as a problem sheet problem as an undergrad physicist.

You know, you you do it for a particle and of course it's can you know potential and it could it could be quite a reasonable number and then you then you find appropriate numbers for a a human and a actual piece of concrete and you get out some

ludicrously double e double exponentially small number.

From that point of view although I'd want to

China modelling, my expectation is there aren't any branches in which I tunnel through the wall.

Because that amplitude is so small that the branch can't be defined as an emergent entity.

It's just washed out by interference effects.

By reasonable size branches.

So in that sense I would expect i i th that that's one sense in which not everything that in a certain sense is possible happens.

The other thing to say is of course, um only those things with non zero amplitude will happen.

So if

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