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
That you
might want to apply to classical gravity.
in the hope of getting a quantum theory of gravity, that are the sorts of bits of technology that you apply to other classical theories, most obviously electromagnetism, but also maybe like point particle mechanics that got you out quantum theories.
So the obvious thing you want to try is let's try applying that machinery.
to um the gravity.
And one way you might do this, this is the Covarian way, is to say, well, ultimately we've got quantum field theory, it tells us um how relativistic fields interact, it gives us Feynman diagrams and path integrals and all this good stuff.
Um
General relativity is a field theory.
And if I'm interested in weak general relativity, it looks like it's the field theory of a spin two particle.
Or spin to field, I should say, on Minkowski spacetime.
Uh people who are deeply into German relativity are tearing their hair out when I say that, but there's at least a sense in which it's true.
Um so you might say, let's just try applying the machinery.
Oh.
re relativistic particle physics to that.
sort of spin two fields and see what comes out.
That's that's covariant quantization.
The other thing you might say is quantization starts with theories that are kind of thrown in the classic sort of Hamiltonian dynamical form where I have a space of an instantaneous state, so I have an evolution rule that moves it forward.
Um, let's throw general relativity into that format and try using the general technology we have for quantizing theories in that format.
And see if that gives us a good quantum theory.
That's canonical quantum gravity.
Showing 541–560 of 1,940 · page 28 of 97
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