A perspective arguing that gravitationally dressed observables generalize crossed product algebras and that quantum gravity may need non-algebraic structure on Hilbert space.
Anti-gravity \`a la Carlotto-Schoen
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abstract
We review the Carlotto-Schoen construction of general relativistic initial data sets which are trivial outside of cones, discuss the context, the implications, and some further developments.
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Quantum gravity observables: observation, algebras, and mathematical structure
A perspective arguing that gravitationally dressed observables generalize crossed product algebras and that quantum gravity may need non-algebraic structure on Hilbert space.