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θ (ξ) <br />
<br />
<br />
(M, ηµν) <br />
rs = 1 ℓ µ <br />
<br />
k µ <br />
<br />
θ (ℓ) = 2<br />
r > 0 θ(k) = − 2<br />
< 0 <br />
r<br />
<br />
<br />
<br />
<br />
(M, gµν) <br />
ℓ µ k µ <br />
θ (ℓ) < 0 θ (k) < 0. <br />
<br />
<br />
<br />
<br />
r < 2M <br />
<br />
r < 2M <br />
<br />
r− < r < r+ <br />
<br />
θ (ℓ) = 0 <br />
r = 2M r = r+ <br />
<br />
<br />
<br />
<br />
Tµν <br />
<br />
u µ <br />
[Tµν − 1<br />
2 T gµν]u µ u ν ≥ 0. <br />
u µ <br />
<br />
<br />
<br />
<br />
(M, gµν)