Matt McIrvin on Nostr: That's kind of what the renormalization group is, which is crucial to all this. It's ...

That's kind of what the renormalization group is, which is crucial to all this. It's how the coupling constants vary as you incorporate bigger or smaller "shells" as part of the fundamental interaction.

But what I was thinking more about is keeping the *variety* of "fundamental interactions" you have to keep track of in your model as you do this from multiplying to infinity, by ignoring things that (you think, at least!) shouldn't matter.