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This is the third paper in a series establishing a quantitative relationbetween inflationary scalar field potential landscapes and the relicperturbations left by the collision between bubbles produced during eternalinflation. We introduce a new method for computing cosmological observablesfrom numerical relativity simulations of bubble collisions in one space and onetime dimension. This method tiles comoving hypersurfaces with locally-perturbedFriedmann-Robertson-Walker coordinate patches. The method extends previouswork, which was limited to the spacetime region just inside the future lightcone of the collision, and allows us to explore the full bubble-collisionspacetime. We validate our new methods against previous work, and present afull set of predictions for the comoving curvature perturbation and localnegative spatial curvature produced by identical and non-identical bubblecollisions, in single scalar field models of eternal inflation. In bothcollision types, there is a non-zero contribution to the spatial curvature andcosmic microwave background quadrupole. Some collisions between non-identicalbubbles excite wall modes, giving extra structure to the predicted temperatureanisotropies. We comment on the implications of our results for futureobservational searches. For non-identical bubble collisions, we also find thatthe surfaces of constant field can readjust in the presence of a collision toproduce spatially infinite sections that become nearly homogeneous deep intothe region affected by the collision. Contrary to previous assumptions, this istrue even in the bubble into which the domain wall is accelerating.

Simulating the Universe(s) III: Observables for the full bubble collision spacetime