Inflaton
= Inflaton
{wiki}
A canonical homogeneous inflaton $\phi(t)$ has
$$
\rho=\frac12\dot\phi^2+V(\phi),
\qquad
P=\frac12\dot\phi^2-V(\phi),
$$
and obeys $\ddot\phi+3H\dot\phi+V'(\phi)=0$.
= Inflaton
{wiki}
A canonical homogeneous inflaton $\phi(t)$ has
$$
\rho=\frac12\dot\phi^2+V(\phi),
\qquad
P=\frac12\dot\phi^2-V(\phi),
$$
and obeys $\ddot\phi+3H\dot\phi+V'(\phi)=0$.