托尔曼度规
托尔曼度规
(
英語:
)是描述
能量-动量张量
为
流体
的
场
的度规,是时间的
函数
。数学表示为:
d
s
2
=
−
d
t
2
+
R
′
¯
2
(
t
,
r
)
1
+
f
(
r
)
d
r
2
+
R
¯
2
(
t
,
r
)
(
d
θ
2
+
sin
2
θ
d
φ
2
)
{\displaystyle \mathrm {d} s^{2}=-\mathrm {d} t^{2}+{\frac {{\bar {R'}}^{2}(t,r)}{1+f(r)}}\mathrm {d} r^{2}+{\bar {R}}^{2}(t,r)(\mathrm {d} \theta ^{2}+\sin ^{2}\theta \mathrm {d} \varphi ^{2})}
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