- #1

jk22

- 723

- 24

How is the ##x^\mu## understood : a 4-vector or the ##\mu##-st component simply ?

If it is a vector, how to write it in spherical coordinate with extra time dimension ?

Btw: why does one not solve EFE in 3 space timensions and then solve the geodesic equation with ##\tau\rightarrow t## ?