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A Background Independent Algebra in Quantum Gravity
Edward Witten
We propose an algebra of operators along an observer's worldline as a background-independent algebra in quantum gravity. In that context, it is natural to think of the Hartle-Hawki…
Anomalies and Nonsupersymmetric D-Branes
Edward Witten
We revisit some aspects of D-brane theory from the point of view of anomalies. When the boundary condition on a worldsheet boson is flipped from Neumann to Dirichlet, worldsheet su…
JT Supergravity and Matrix Models
Gustavo J. Turiaci, Edward Witten
Generalizing previous results for and , we analyze JT supergravity on asymptotically AdS spaces with arbitrary topology and show that this theory of gravity…
Algebras, Regions, and Observers
Edward Witten
In ordinary quantum field theory, one can define the algebra of observables in a given region in spacetime, but in the presence of gravity, it is expected that this notion ceases t…
The Timelike Tube Theorem in Curved Spacetime
Alexander Strohmaier, Edward Witten
The timelike tube theorem asserts that in quantum field theory without gravity, the algebra of observables in an open set U is the same as the corresponding algebra of observables…
Algebras and States in JT Gravity
Geoff Penington, Edward Witten
We analyze the algebra of boundary observables in canonically quantised JT gravity with or without matter. In the absence of matter, this algebra is commutative, generated by the A…