Well I'm trying to understand the difference between these propagators:(adsbygoogle = window.adsbygoogle || []).push({});

[itex] \frac{g_{\mu \nu}}{k^{2} - m^2 + i \epsilon}[/itex]

and

[itex] \frac{g_{\mu \nu}+ \frac{ k_{\mu} k_{\nu}}{m^{2}}}{k^{2} - m^2 + i \epsilon}[/itex]

My professor told me that they are different gauges, and the from the second you rule out the goldstone modes. Can someone explain it to me a little better or refer me to some textbook? I don't also get the meaning of goldstone modes- if you have a massive vector boson then you don't have goldstone modes [they become the longitudial dofs]

Also I am having one more question. If the first doesn't kill out the goldstone bosons, then can someone -after arriving at the end result- kill them? Maybe by a gauge transformation? and what gauge transformation?

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# Vector Boson Propagator and gauge

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