  In order to discuss and obtain the remaining inflaton potential, we
introduced an idea called "effective static friction" in our last paper to
balance the "force", $\frac{dV}{d\phi}|_{\phi=\phi(t_{rest})}$, of inflaton.
According to this idea, we now discover that, after the course of particle
creation, there will be a relationship between the final relativistic particle
number inside an arbitrary chosen comoving volume $N_r(t_{rest})$ and the
effective cosmological constant $\Lambda$ in our Universe. This relationship
can be expressed as $N_r(t_{rest})=(\frac{\ell^2m_\phi^2\Lambda}{4\pi
G\sigma^2(t_{rest})})^{3/2}$ when we employ the classical chaotic model,
$V(\phi)=1/2m_{\phi}^2\phi^2$, and consider that $\phi$ comes to rest at
$t_{rest}$. Moreover, we obtain an evolution equation for the particle number
($N_r(t)$) inside the comoving volume. Meanwhile, a new inflaton field equation
which contains parameters of $N_r(t)$ and "particle creation coefficients" can
also be found. Importantly, the results illustrate the fact that $\Lambda$ and
$N_r$ are the results of probability.
