whyT^[ab][;b]≠T_[ab][;b] for spatially flat FLWR cosmology ((ds)^2=(c^2)* (dt)^2-a(t)^2[(dx)^2+(dy)^2+(dz)^2])?(adsbygoogle = window.adsbygoogle || []).push({});

τ[ab][/;b] gives the right answer, but not τ[ab][/;b].

(T^(ab) or T_(ab)) contra-variant and co-variant energy momentum tensor of perfect fluid

(;) covariant derivative,

(c) spped of light in vacuum

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# A Divergence of (covaraint) energymomentum tensor

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