Elliptic de Sitter space as a model for observer complementarity

Elliptic de Sitter space is a maximally symmetric spacetime which is not time orientable where cosmological horizons have only one side Quantum field theory in this spacetime does not exist globally but only for individual observers This provides a working model for Susskind s horizon complementarity principle I motivate a recipe for translating states and observables between the world pictures of the different observers In particular we recover the thermal state at th