# Feynman rules for gravity

+ 0 like - 0 dislike
617 views

Feynman rules is the basic tool to compute amplitudes in perturbation theory for a QFT. Here, I am trying to understand perturbation theory in GR around the flat space metric, in terms of Feynman rules. There are two basic questions one can ask here :

1) What is the graviton propagator?

2) What is the off shell 3 point function for GR vertex?

DeWitt has a collection of papers which contain this but the expression for the vertex is slightly obscure and very prone to errors when we expand the symmetrized terms by hand. Hence, can someone please write down the full off shell 3 point vertex explicitly.

Also, he works in the de-Donder gauge, in which the 3 point vertex is sufficiently lengthy. Is there a gauge choice in which the Feynman rules for GR is simpler, and less tedious. Why is that gauge choice not popular in the literature?

 Please use answers only to (at least partly) answer questions. To comment, discuss, or ask for clarification, leave a comment instead. To mask links under text, please type your text, highlight it, and click the "link" button. You can then enter your link URL. Please consult the FAQ for as to how to format your post. This is the answer box; if you want to write a comment instead, please use the 'add comment' button. Live preview (may slow down editor)   Preview Your name to display (optional): Email me at this address if my answer is selected or commented on: Privacy: Your email address will only be used for sending these notifications. Anti-spam verification: If you are a human please identify the position of the character covered by the symbol $\varnothing$ in the following word:p$\hbar$ysi$\varnothing$sOverflowThen drag the red bullet below over the corresponding character of our banner. When you drop it there, the bullet changes to green (on slow internet connections after a few seconds). To avoid this verification in future, please log in or register.