Carlo Rovelli Geometry & Physics Workshop, École Normale Supérieure, Paris 2010
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Recorded at Geometry & Physics Workshop, École Normale Supérieure, Paris (2010), featuring Carlo Rovelli. From the Michael Wright Collection, held by the Archive Trust for Research in Mathematical Sciences & Philosophy.

Identifier
mw0003833-bd_p
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Audio recording
Collection
Michael Wright Collection
Repository
Archive Trust for Research in Mathematical Sciences & Philosophy
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0:00 Anyway, so this is a generalization of topological quantum filtering where you replace many faults by one complex and two complexes. And so this is in fact a topological filtering plus the contraint, right? So, in fact, this is a constraint which should tell you how you go from one SU2 representation to a Lorentz representation, yes. And if you compare to the work of Crane, then he defined the time functor in this case, which has a very specific form. correspond to this time functor so defined, or is it different? It is the same. The same. The same. What happens here is that if you give me an SU2 representation J, these two little things that keeps for you a SN2C representation, where P is gamma J and K is J. In fact, a little that, it also picks within this representation a subspace, which is the reducible component of the specular C2 with spin J. So I'm using this, this is the J subspace, J is the C2, of the peak representation. I'm picking up the subspaces with J gamma J J. So this is exactly Crane factor. So this is a simplicity constraint which defines the time functor, right? That's exactly it. In fact, Crane has a description of that in terms of a functor between two categories that is... Question? I guess it's more of a comment, I think. I want the audience to recall Carlos' main point, which I was really impressed with, which is the idea that quantum gravity involves properties of space-time at small scale.

2:30 And it turns out that if you combine that idea with the question of energy requirements of this signal. That's something that has been ignored largely. That there's an evolutionary solution. And I'm going to predict that, and it so happens that there was a presentation to the experimental group a few blocks away yesterday. And that idea, combined with the the concept of looking at the energy requirement of the gravitational signal, I'm going to make a prediction that a formal recognition of the solution to the problem is no more than maybe a year away, I think, so. I hope you're right. If you would like to look at the material that was presented to the experimental group here at ENS, I apologize, but probably the best way to do that is to just Google the It's been posted on the web if you Google Alex Mayer, M-A-Y-E-R, and it's the first bit and you should see some material there. It's not on the artifact yet. Okay, thank you.