Abstract: I will discuss a certain (1+1)-dimensional model of de Sitter space with an interesting bulk emergence property. I will also touch on the conjectured holographic duality of this model with the infinite-temperature double-scaled SYK model as well as open issues in probing behind-the-horizon physics within these models.
Abstract: Quantum Focusing is a powerful conjecture, which plays a key role in the current proofs of manywell-known quantum gravity theorems, including various consistency conditions, and causality constraints in AdS/CFT. I conjecture a (weaker) restricted quantum focusing, which I argue is sufficientto derive all known essential implications of quantum focusing. Subject to a technical assumption,I prove this conjecture, to all … Read More
Abstract: We show that if a massive (or charged) body is put in a quantum superposition of spatially separated states in the vicinity of any (Killing) horizon, the mere presence of the horizon will eventually destroy the coherence of the superposition. This occurs because, in effects, the long-range fields sourced by the superposition register on the horizon which forces the … Read More
Do the postulates of quantum mechanics survive in quantum gravity? The probabilistic interpretation of amplitudes, enforced by the unitarity of time evolution, is not guaranteed within the path integral formulation and has to be checked. Leveraging the gravitational path integral, we find a non-perturbative mechanism whereby a sum over smooth geometries leads to isometric rather than unitary evolution, which we demonstrate … Read More