  We study the Wheeler-DeWitt (WDW) equation close to the Big-Bang. We argue
that an interaction dominated fluid (speed of sound equal to the speed of
light), if present, would dominate during such an early phase. Such a fluid
with $p=\rho\propto1/a^{6}$ generates a term in the potential of the wave
function of the WDW equation proportional to $-1/a^{2}.\ $This very peculiar
quantum potential, which embodies a spontaneous breaking of dilatation
invariance, has some very remarkable consequences for the wave function of the
Universe: $\Psi(a)$ vanishes at the Big-Bang: $\Psi(0)=0$; the wave function
$\Psi(a)$ is always real; a superselection rule assures that the system is
confined to $a\geq0$ without the need of imposing any additional artificial
barrier for unphysical negative $a$. These results do not depend on the
operator-ordering problem of the WDW equation.
