- #1
Phymath
- 184
- 0
I'm reading a QFT text right now and to fully understand the physical perturbation theory method I would like anyone to suggest a refrence or supply an example of a calculation using the physical perturbation theory:
As an example to start a discussion consider.
[tex]
L = \frac{1}{2}((\partial \phi)^2 - m_p^2 \phi^2) - \frac{\lambda_p}{4!}\phi^4 + A(\partial \phi)^2+B \phi^2 + C\phi^4
[/tex]
how might one go about calculating the propagator out to say second order in lambda obviously in bare qft i would arrive at
[tex]D(k) = \frac{1}{k^2 - m_0^2 + i \epsilon}[/tex] + divergent terms
but i am unsure how to use the physical theory to this end
As an example to start a discussion consider.
[tex]
L = \frac{1}{2}((\partial \phi)^2 - m_p^2 \phi^2) - \frac{\lambda_p}{4!}\phi^4 + A(\partial \phi)^2+B \phi^2 + C\phi^4
[/tex]
how might one go about calculating the propagator out to say second order in lambda obviously in bare qft i would arrive at
[tex]D(k) = \frac{1}{k^2 - m_0^2 + i \epsilon}[/tex] + divergent terms
but i am unsure how to use the physical theory to this end