- #1
jmlaniel
- 29
- 0
I am trying to proove that the following relation:
[tex]A_{\nu}[/tex] [tex]\partial_{\mu}[/tex] [tex]\partial^{\nu}[/tex] [tex]A^{\mu}[/tex] = [tex]A_{\nu}[/tex] [tex]\partial^{\mu}[/tex] [tex]\partial^{\nu}[/tex] [tex]A_{\mu}[/tex]
The only way I found is by setting:
[tex]A_{\nu}[/tex] [tex]\partial_{\mu}[/tex] [tex]\partial^{\nu}[/tex] [tex]A^{\mu}[/tex] = [tex]A_{\nu}[/tex] [tex]\partial_{\mu}[/tex] [tex]\partial^{\nu}[/tex] [tex]g^{\mu \sigma}[/tex] [tex]A_{\sigma}[/tex]
Then by imposing that the metric is the Minkowski metric (all constant), their derivatives are all equal to zero so I can get the metric out of the derivative and get :
[tex]A_{\nu}[/tex] [tex]\partial_{\mu}[/tex] [tex]\partial^{\nu}[/tex] [tex]A^{\mu}[/tex] = [tex]A_{\nu}[/tex] [tex]g^{\mu \sigma}[/tex] [tex]\partial_{\mu}[/tex] [tex]\partial^{\nu}[/tex] [tex]A_{\sigma}[/tex]
Then by contracting the metric with the first derivative and renaming the indices, I can achieve my goal.
My question is the following one : can I achieve this without imposing the Minkowsky metric?
Thank!
[tex]A_{\nu}[/tex] [tex]\partial_{\mu}[/tex] [tex]\partial^{\nu}[/tex] [tex]A^{\mu}[/tex] = [tex]A_{\nu}[/tex] [tex]\partial^{\mu}[/tex] [tex]\partial^{\nu}[/tex] [tex]A_{\mu}[/tex]
The only way I found is by setting:
[tex]A_{\nu}[/tex] [tex]\partial_{\mu}[/tex] [tex]\partial^{\nu}[/tex] [tex]A^{\mu}[/tex] = [tex]A_{\nu}[/tex] [tex]\partial_{\mu}[/tex] [tex]\partial^{\nu}[/tex] [tex]g^{\mu \sigma}[/tex] [tex]A_{\sigma}[/tex]
Then by imposing that the metric is the Minkowski metric (all constant), their derivatives are all equal to zero so I can get the metric out of the derivative and get :
[tex]A_{\nu}[/tex] [tex]\partial_{\mu}[/tex] [tex]\partial^{\nu}[/tex] [tex]A^{\mu}[/tex] = [tex]A_{\nu}[/tex] [tex]g^{\mu \sigma}[/tex] [tex]\partial_{\mu}[/tex] [tex]\partial^{\nu}[/tex] [tex]A_{\sigma}[/tex]
Then by contracting the metric with the first derivative and renaming the indices, I can achieve my goal.
My question is the following one : can I achieve this without imposing the Minkowsky metric?
Thank!