Hi I'm a newbie for GR so please answer my basic question(adsbygoogle = window.adsbygoogle || []).push({});

in empty space why we say for 2 or 3 Dimensions field equations in that region must have a curvature tensor equal to 0

but when we say about 4-D or higher , the curvature tensor which non-vanish can satisfy EFE?

I think when we say "empty space" it should mean that no energy or momentum so curvature must be zero

thank,

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# EFE in empty space

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