# Why do we not call the effective potential(QFT) being density of effective action?

1. Aug 25, 2011

### ndung200790

Why do we not call V$_{eff}$=$\Gamma_{eff}$/VT (where $\Gamma$$_{eff}$ is the effective action, VT is spacetime volume) being density of effective action of field?
I have just known(from Schoeder's QFT book) that V$_{eff}$=v$_{0}$($\Phi$$_{cl}$)$\Phi$$^{4}_{cl}$.Then this must be called effective potential,because it relates with interaction Phi-4(this case is an example) but must not be called density of action.Is that correct?