Notes on #Physics Discussions: Here’s #BrianGreene interviewing #EdWitten for #WorldScienceFestival . They cover some interesting ground but you have to be a bit familiar with #StringTheory to know where it’s going. Oddly it seems as if someone told Ed “talk all you want but don’t use any math or physics language” . So the more you know the more comical the whole thing is. Ed Witten, as far as his work goes…is terrifying in all the best ways possible. Read the papers
Ce que cet homme est capable de construire à partir de petits morceaux de #PhysiqueFondamentale éparpillés sur 50 ans de littérature est absolument incroyable.
We describe a simple gauge-fixing that leads to a construction of a quantum Hilbert space for quantum gravity in an asymptotically Anti de Sitter spacetime, valid to all orders of perturbation theory. The construction is motivated by a relationship of the phase space of gravity in asymptotically Anti de Sitter spacetime to a cotangent bundle. We describe what is known about this relationship and some extensions that might plausibly be true. A key fact is that, under certain conditions, the Einstein Hamiltonian constraint equation can be viewed as a way to gauge fix the group of conformal rescalings of the metric of a Cauchy hypersurface. An analog of the procedure that we follow for Anti de Sitter gravity leads to standard results for a Klein-Gordon particle.
KilleansRow 🇺🇲 🇺🇦🍀
mmanu