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3

Redshifts are plotted because usually that is all that can be measured. Other quantities could be plotted, but since these are inferred from the redshift itself (e.g. density would just mean plotting $(1+z)^3$), or would need to assume particular cosmological models or parameters (e.g. if you plotted look-back time), then it makes sense to stick with ...


2

As I understand it, the presence of an event horizon (EH) from gravitational collapse is a case in which GR violates local causality in the outer (w.r.t. EH) universe. By Birkhoff theorem the EH can only be caused by the inner T, not by whatever is outside the EH. The (collapse) EH yields a causal disconnection: the outside is not affected by what is on or ...


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