If the time component of spacetime does not "expand" in the sense that space expands, doesn't that imply that time must already exist in its entirety, past and future? I believe I have seen the opinion expressed by popular physicists that time could be expanding. That would nicely explain how the future comes to exist. Is the non-expanding character of time physically real or is it just an aspect of the way we measure things?
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1Time dilates much like space in relativity, if that is what your question is referring to? See Lorentz Transform for more. – xXx_69_SWAG_69_xXx Jan 24 '21 at 01:00
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1Is the FRW metric physically distinguishable from a metric with a speed of light that changes over time? – mmesser314 Jan 24 '21 at 03:38