I know that the classical picture of QED is Coulomb interaction, magnetic interaction etc. But what does the classical phi^4 theory look like? In particular, do particles attract or repel each other in this theory?(adsbygoogle = window.adsbygoogle || []).push({});

P.S. I'm surprised that my field theory books never discuss this. (At least in Peskin & Schroder's introductory chapter on scalar field theory.)

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# What's the classical picture of phi^4 scalar field theory?

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