Feynman diagrams for phi-cubed theory

Feynman diagrams for phi-cubed theory

This entry was posted in Uncategorized. Bookmark the permalink.

3 Responses to Feynman diagrams for phi-cubed theory

  1. AryaDatta says:

    In case of the diagrams at the 2nd order, should we not have one more? That should arise as a disconnected diagram, comprising two connected parts: one being the delta function term corresponding to free propagation of a particle, and the other being a vacuum diagram. The vacuum diagram would look like the dumbbell diagram of Fig. 22.2(a) from L&B, and has a contraction of phi(y) with itself, a contraction of phi(w) with itself, and a contraction of phi(y) with phi(w): completing all 6 phi terms in the process.

    Like

    • AryaDatta says:

      In short, what I mean is that there should be an extra diagram at 2nd order which would look pretty much like figure 20.3(a) of L&B. Sorry if this is confusing without explicit drawings. 😦

      Like

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s