Subsystems and Entanglement Beyond the Semiclassical Limit for de Sitter Screens

Develop a nonperturbative definition of subsystems of a holographic screen in static patch holography and a framework to compute their entanglement beyond the semiclassical limit where the screen location fluctuates.

Background

Unlike AdS boundaries, de Sitter screens are not asymptotic. Beyond the semiclassical limit, backreaction and fluctuations of the screen are expected to be significant, making it unclear how to define subregions consistently or how to compute associated entanglement measures.