  Due to quantum fluctuations, spacetime is foamy on small scales. For maximum
spatial resolution of the geometry of spacetime, the holographic model of
spacetime foam stipulates that the uncertainty or fluctuation of distance $l$
is given, on the average, by $(l l_P^2)^{1/3}$ where $l_P$ is the Planck
length. Applied to cosmology, it predicts that the cosmic energy is of critical
density and the cosmic entropy is the maximum allowed by the holographic
principle. In addition, it requires the existence of unconventional (dark)
energy/matter and accelerating cosmic expansion in the present era. We will
argue that a holographic foam cosmology of this type has the potential to
become a full fledged competitor (with distinct testable consequences) for
scalar driven inflation.
