Lesson 22 路径积分 (II)

回顾一下：对于 Schwarzschild 黑洞， d τ 2 = ρ 2 d t 2 ( 4 G M ) 2 − d ρ 2 − r 2 d Ω 2 \mathrm{d}\tau^2 = \rho^2\frac{\mathrm{d}t^2}{(4GM)^2}-\mathrm{d}\rho^2-r^2\mathrm{d}\Omega^2 d τ 2 = ρ 2 ( 4 GM ) 2 d t 2 ​…