This is probably a stupid question but does k=1,0,-1 correspond to closed,flat,open refer to space or space-times?(adsbygoogle = window.adsbygoogle || []).push({});

Looking at a derivation what each geometrically represents is only done when talking about the spatial part of the FRW metric.

As space can be flat and space-time still curved couldn't the , say k=0, space be flat, but space-time not flat.

Why is it that we say k=0 gives a flat 'universe' etc.

Thanks in advance

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# FRW metric, parameter k characterizes space or space-time?

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