Applying Perturbation Theory Flashcards
1
Q
Define 1PI
A
One particle irreducible (1PI) diagrams cannot be separated into two disconnected
pieces by cutting one edge.
2
Q
Define amputated diagrams
A
Amputated diagrams are obtained from a generic diagram for Gn by removing all
the external legs
3
Q
What is the amputated correlation function
A
given
by the sum of all such diagrams
4
Q
Define the Mandelstam invariants
A
4
Q
State the Feynman parameter trick
A
5
Q
Give the Lagranian with counterterms for scalar 4th theory?
A
6
Q
Give the new feynman rules for counterterms
A
7
Q
Define the superficial degree of divergence
A
8
Q
State the relationship between loops and vertices
A
9
Q
Give the formula of M
A
