- #1
BradC
- 4
- 0
In A. Zee "QFT in a nutshell" in chapter I.5 Exercise 1.5.1 on page 39 for spin 2 massive propagator. I know I’m missing something very simple (self-taught beginner). I'm trying to derive equation (13) on page 35, which is
[tex]G_{\mu\nu,\lambda\sigma} = G_{\mu\lambda}G_{\nu\sigma} + G_{\mu\sigma}G_{\nu\lambda} - 2/3 * G_{\mu\nu}G_{\lambda\sigma}[/tex]
I created something similar to equation (22) by multiplying the three unique forms(eliminating symmetric permutations) of
[tex](g_{\mu\nu}-k_{\mu}k_{\nu})[/tex]
Then I use
[tex]k^{\mu} G_{\mu\nu,\lambda\sigma}= 0[/tex]
for
[tex]k^{\mu}, k^{\nu}, k^{\lambda}, k^{\sigma}.[/tex]
Then for equation (22), I get B = -A/2, D = -C/2, E = 0, which brings me to:
[tex]G_{\mu\nu,\lambda\sigma} = G_{\mu\lambda}G_{\nu\sigma} + G_{\mu\sigma}G_{\nu\lambda} - 2 G_{\mu\nu}G_{\lambda\sigma} - 2G_{\mu\nu}k_{\lambda}k_{\sigma} -2 G_{\lambda\sigma}k_{\mu}k_{\nu} + G_{\nu\sigma}k_{\mu}k_{\lambda} + G_{\nu\lambda}k_{\mu}k_{\sigma}+ G_{\mu\lambda}k_{\nu}k_{\sigma}+ G_{\mu\sigma}k_{\nu}k_{\lambda}[/tex]
I'm lost as to the next step to get to:
[tex]G_{\mu\nu,\lambda\sigma} = G_{\mu\lambda}G_{\nu\sigma} + G_{\mu\sigma}G_{\nu\lambda} - 2/3 * G_{\mu\nu}G_{\lambda\sigma}[/tex]
MANY thanks in advance for filling in some missing gap in knowledge or very simple error in arithmetic.
[tex]G_{\mu\nu,\lambda\sigma} = G_{\mu\lambda}G_{\nu\sigma} + G_{\mu\sigma}G_{\nu\lambda} - 2/3 * G_{\mu\nu}G_{\lambda\sigma}[/tex]
I created something similar to equation (22) by multiplying the three unique forms(eliminating symmetric permutations) of
[tex](g_{\mu\nu}-k_{\mu}k_{\nu})[/tex]
Then I use
[tex]k^{\mu} G_{\mu\nu,\lambda\sigma}= 0[/tex]
for
[tex]k^{\mu}, k^{\nu}, k^{\lambda}, k^{\sigma}.[/tex]
Then for equation (22), I get B = -A/2, D = -C/2, E = 0, which brings me to:
[tex]G_{\mu\nu,\lambda\sigma} = G_{\mu\lambda}G_{\nu\sigma} + G_{\mu\sigma}G_{\nu\lambda} - 2 G_{\mu\nu}G_{\lambda\sigma} - 2G_{\mu\nu}k_{\lambda}k_{\sigma} -2 G_{\lambda\sigma}k_{\mu}k_{\nu} + G_{\nu\sigma}k_{\mu}k_{\lambda} + G_{\nu\lambda}k_{\mu}k_{\sigma}+ G_{\mu\lambda}k_{\nu}k_{\sigma}+ G_{\mu\sigma}k_{\nu}k_{\lambda}[/tex]
I'm lost as to the next step to get to:
[tex]G_{\mu\nu,\lambda\sigma} = G_{\mu\lambda}G_{\nu\sigma} + G_{\mu\sigma}G_{\nu\lambda} - 2/3 * G_{\mu\nu}G_{\lambda\sigma}[/tex]
MANY thanks in advance for filling in some missing gap in knowledge or very simple error in arithmetic.