# Interaction term in the field Lagrangian

*From*: "roman" <xalbert76@xxxxxxxxx>*Date*: 8 May 2006 18:51:30 -0700

Can anybody explain me how to imagine interactions between two fields

in the Minkowski space ? For simplicity, if phi is a real scalar field

and the Lagrangian density contains a term of the order phi^4, how can

I understand this term ? If I recall the simple Ising model, the

product of two different spins s_i*s_j gives their interaction strength

which is +1 if the spins are aligned and -1 if anti-aligned; the

interaction occurs at all times and only between different spins. Can

something equally simple be invoked in the field theory ?

Roman

.

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