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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Appearances
Um I can just formally say for any metric G, G equals um G zero, the Minkowski metric, plus H, everything else.
Per definition H is G minus G zero.
And then I could say, well, you know, H is just another field on flat space time.
And I could treat it as a field just the same way we treat the electromagnetic field.
Um and um
Uh any well any field you like, really.
So what's wrong with that?
I mean in a certain sense nothing.
Um I think it's an informative way of thinking, but the um the the the concern you might have about it, so
Firstly, you could say look, that splitting of space-time into flat space-time plus a field on flat space-time completely breaks the kind of geometric
understanding of gravity.
That was very much how Einstein looked at it.
Um
And, you know, if you look at Weinberg, who has a book on German relativity that very much takes this kind of route, Weinstein will basically say, Yeah, absolutely, I'm breaking the geometric, um
uh understanding of gravity, say what, the geometric understanding of gravity is overrated.
Um and that's a that's so there's that that's a big cultural disagreement between, you might say, relativists and particle physicists.
Um the other more technical reason to be concerned is that that um well in particle physics language that split I just made is wildly gauge dependent.
Um
Uh in
i in a slightly boudarized version of the general relativity description, I'd say it's wildly coordinate dependent.
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