= Komar angular momentum
{c}
{title2=$J=(16\pi)^{-1}\int_S\star dm$}
<Komar angular momentum> is the <Komar charge> associated with an axial <Killing vector field> in four-dimensional <general relativity>. In geometrized units its normalization is $(16\pi)^{-1}\int_S\star dm$, where $m$ is the metric-dual <differential one-form>. With zero <cosmological constant>, vacuum <Einstein field equations> make $d\star dm=0$, so homologous surrounding surfaces in the vacuum region give the same charge.
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