- #1
robousy
- 334
- 1
I've been wondering about terms you typically find in the action of a field theory, for example consider the kinetic term of a scalar field
[tex]S=\int d^4x(\partial_\mu\phi\partial^\mu\phi).[/tex]
I've read that it can be thought of as the kinetic energy of the field - but this just doesn't sit to well with me for some reason. I mean the kinetic energy of a massless field seems strange.
Can anyone here provide any deeper insights into this?
[tex]S=\int d^4x(\partial_\mu\phi\partial^\mu\phi).[/tex]
I've read that it can be thought of as the kinetic energy of the field - but this just doesn't sit to well with me for some reason. I mean the kinetic energy of a massless field seems strange.
Can anyone here provide any deeper insights into this?