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

So there were the precursors of those ideas in um yeah, well, d d D Dirac's looking at this stuff in the thirties and forties, I think.

But um uh Bryce DeWitt kind of

writes some very seminal papers on this, I think, in the fifties, that very much coined this kind of covariant and canonical language.

And to some extent the path to quantum gravity has followed those two alternatives ever since.

I mean the the canonical approach to quantum gravity eventually matures into loop quantum gravity in the hands of people like Smolin and Ashtakar.

Um Rivelli.

Um the

covariant root kind of in a somewhat more indirect path matures into string theory.

Um and you've got quite different traditions playing this game.

The people who are trying to do the canonical quantum gravity approach are generally people whose true love is classical gender and relativity.

And the people who are doing the covariant approach are people whose true love is particle physics.

Aaron Ross Powell Right.

So the the way German relativity works is you have this object, space-time metric, you normally call it G, uh, which determines the the distances between points in space-time indirectly determines the curvature of space-time, all the stuff that defines space-time.

And and we know for instance that

Flat space-time, Minkowski space-time, special relativistic space-time is an example of a space-time like that.

So I can write um

as a particular choice of G, call it G zero, I can just choose the um

Uh the Minkowski space time metric, the flat man.

And now I can take formally speaking, I can take any metric G, at least if I assume space-time sort of topologically looks like

you know, slap Minkowski's basetime or or or if I just work in just a region of it that's not too complicated.

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