All Questions
4 questions
3
votes
1
answer
113
views
How does the $\not{\partial}$ work in the Dirac Lagrangian?
The Dirac Lagrangian (Density) is defined in the text "Quantum Field Theory, An Integrated Approach" by Fradkin as:
$$\mathcal{L}=\bar{\Psi}\left(i\not{\partial}-m\right)\Psi\equiv \frac{1}{...
0
votes
0
answers
109
views
Dirac spinor and derivative
I have question about four-derivative on spinors.
$$
\bar{\psi}\partial_\mu
$$
Does the derivative act on the spinor psi bar?
$$
(\bar{\psi}\partial_\mu)\psi
$$
$$
\bar{\psi}\partial_\mu\psi
$$
Is it ...
0
votes
1
answer
1k
views
What is $D$ or $D$-with-a-slash-through-it in the Standard Model equation(s)?
In the mathematical formulation of the Standard Model, which I do not understand yet, there is a capital letter $D$ or $D$-with-a-slash-through-it that I can't find an explanation for.
Flip Tanedo (a ...
5
votes
1
answer
536
views
What is the definition of $\overleftrightarrow{\partial}$ in Dirac Lagrangian?
In my course, the teacher wrote the Dirac Lagrangian as :
$$ \mathcal{L}=\frac{i}{2} \bar{\psi}\gamma^{\mu}\overleftrightarrow{\partial_\mu} \psi -m \bar{\psi} \psi $$
I just would like to ...