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(adsbygoogle = window.adsbygoogle || []).push({});

[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?

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# Kinetic Terms

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