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Σ <br />
<br />
<br />
( ∂<br />
∂ϕ )µ <br />
H Σ S <br />
l µ = ( ∂<br />
∂t )µ + Ω( ∂<br />
∂ϕ )µ <br />
k µ S <br />
kµl µ = −1 <br />
κ = −∇µlνk ν l µ . <br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
<br />
δM = κ<br />
8π δA + ΩδJ, <br />
A t J <br />
Ω