What is a Lagrangian of a photon?

Question

In sense of classical mechanics+special relativity what is lagrangian of a photon? Lagrangian of a relativistic massive particle is as follows: $$ L_{massive}= -mc\sqrt{c^2-v^2} $$ So is it a zero?

score 1 · Answer 1 · edited Apr 13 '17 at 12:39

1

Classical electrodynamics has a lagrangian for the classical fields, see discussion here .

The photon is an elementary particle and does not have a classical existence.

Here is on page 5 the Lagrangian for a photon

edited Apr 13 '17 at 12:39

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answered Oct 12 '15 at 15:27

anna v

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What is a Lagrangian of a photon?

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