- #1
nolanp2
- 53
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in my fields course we are using the metric tensor g=diagonal(1,-1,-1,-1), off diagonal(0)
i'm looking for an explanation of why the time coordinate has to be orientated oppositely to the spatial coordinates. can anyone give me an explanation of this?
i'm also lost with upper and lower indices. i don't understand why multiplying a lower index by the metric tensor gives an upper index.
any help appreciated, thanks
i'm looking for an explanation of why the time coordinate has to be orientated oppositely to the spatial coordinates. can anyone give me an explanation of this?
i'm also lost with upper and lower indices. i don't understand why multiplying a lower index by the metric tensor gives an upper index.
any help appreciated, thanks