- #1
Vic Sandler
- 4
- 3
The problem is on pages 323 and 324 of the second edition.
Given the lagrangian
[tex]\mathcal{L} = -\frac{1}{4}F_{\mu\nu}(x)F^{\mu\nu}(x) - \frac{1}{2\alpha}(\partial_{\mu}A^{\mu})^2[/tex]
show that the momentum space photon propoagator is given by
[tex]D_F^{\mu\nu}(k) = \frac{-g^{\mu\nu} + \delta k^{\mu}k^{\nu}/k^2}{k^2 + i\epsilon}[/tex]
[tex]\delta = 1 - \alpha^{-1}[/tex]
I can solve this problem if I set
[tex]\delta = 1 - \alpha[/tex]
but not with the delta stated in the book.
My question is this:
Should the book say [itex]\delta = 1 - \alpha[/itex] and not [itex]\delta = 1 - \alpha^{-1}[/itex]?
This question and this question only. The meat of the answer will be one word.
Homework Statement
Given the lagrangian
[tex]\mathcal{L} = -\frac{1}{4}F_{\mu\nu}(x)F^{\mu\nu}(x) - \frac{1}{2\alpha}(\partial_{\mu}A^{\mu})^2[/tex]
show that the momentum space photon propoagator is given by
[tex]D_F^{\mu\nu}(k) = \frac{-g^{\mu\nu} + \delta k^{\mu}k^{\nu}/k^2}{k^2 + i\epsilon}[/tex]
Homework Equations
[tex]\delta = 1 - \alpha^{-1}[/tex]
The Attempt at a Solution
I can solve this problem if I set
[tex]\delta = 1 - \alpha[/tex]
but not with the delta stated in the book.
My question is this:
Should the book say [itex]\delta = 1 - \alpha[/itex] and not [itex]\delta = 1 - \alpha^{-1}[/itex]?
This question and this question only. The meat of the answer will be one word.