  In this letter we investigate the role played by quantum mechanics before the
big-bang in heterotic-M-theory assuming an orbifold compactification of time.
As we will see particles are localized around a black hole but only in regions
where a constructive quantum interference takes place. We infer that the
creation of this interference pattern is interesting for many reasons: (A) it
is a mechanism to localize particles on $S^4$ branes; (B) the Casimir potential
for the dilaton can be interpreted as a gravitational effective potential for a
two-body problem; (C) the quantum interference is a new way to define the
branes in heterotic-M-theory. Remarkably, a modified Schroedinger equation is
obtained. The stabilization of the branes' position is related to the absence
of a cosmological singularity.
