From bcae81336764eb6c4cdf0f91e2fe632b625dd8b2 Mon Sep 17 00:00:00 2001
From: Prefetch
Date: Sun, 23 Oct 2022 22:18:11 +0200
Subject: Optimize and improve naming of all images in knowledge base
---
source/know/concept/self-energy/index.md | 12 +++---------
1 file changed, 3 insertions(+), 9 deletions(-)
(limited to 'source/know/concept/self-energy/index.md')
diff --git a/source/know/concept/self-energy/index.md b/source/know/concept/self-energy/index.md
index 005f135..f233466 100644
--- a/source/know/concept/self-energy/index.md
+++ b/source/know/concept/self-energy/index.md
@@ -204,9 +204,7 @@ that exactly $$2^m m!$$ diagrams at each order are topologically equivalent,
so we are left with non-equivalent diagrams only.
Let $$G(b,a) = G_{ba}$$:
-
-
-
+{% include image.html file="expansion.png" width="90%" alt="Full expansion of G in Feynman diagrams" %}
A **reducible diagram** is a Feynman diagram
that can be cut in two valid diagrams
@@ -217,9 +215,7 @@ At last, we define the **self-energy** $$\Sigma(y,x)$$
as the sum of all irreducible terms in $$G(b,a)$$,
after removing the two external lines from/to $$a$$ and $$b$$:
-
-
-
+{% include image.html file="definition.png" width="90%" alt="Definition of self-energy" %}
Despite its appearance, the self-energy has the semantics of a line,
so it has two endpoints over which to integrate if necessary.
@@ -238,9 +234,7 @@ Thanks to this recursive structure,
you can convince youself that $$G(b,a)$$ obeys
a [Dyson equation](/know/concept/dyson-equation/) involving $$\Sigma(y, x)$$:
-
-
-
+{% include image.html file="dyson.png" width="95%" alt="Dyson equation in Feynman diagrams" %}
This makes sense: in the "normal" Dyson equation
we have a one-body perturbation instead of $$\Sigma$$,
--
cgit v1.2.3