Schr\"odinger's cat for de Sitter spacetime

Understand

Quantum gravity is expected to contain descriptions of semiclassical spacetime geometries in quantum superpositions.

• To date, no framework for modelling such superpositions has been devised.
• Here, we provide a new phenomenological description for the response of quantum probes (i.e.
• Unruh-deWitt detectors) on a spacetime manifold in quantum superposition.