= Magnetic part of the Weyl tensor
{title2=$B_{ab}=\tfrac12\epsilon_{acde}C^{de}{}_{bf}n^cn^f$}
= Magnetic Weyl tensor
{synonym}
In four spacetime dimensions, relative to a timelike <unit normal> $n$, define $B_{ab}=\tfrac12\epsilon_{acde}C^{de}{}_{bf}n^cn^f$, with the chosen spacetime <metric volume tensor>. This is the dual tidal part of the <Weyl tensor>. Normal contractions vanish by curvature and volume-tensor antisymmetry. Its sign depends on the specified orientation and dualization convention.
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