  Hidden sector glueball dark matter is well motivated by string theory,
compactifications of which often have extra gauge groups uncoupled to the
visible sector. We study the dynamics of glueballs in theories with a period of
late time primordial matter domination followed by a low final reheating
temperature due to a gravitationally coupled modulus. Compared to scenarios
with a high reheating temperature, the required relic abundance is possible
with higher hidden sector confinement scales, and less extreme differences in
the entropy densities of the hidden and visible sectors. Both of these can
occur in string derived models, and relatively light moduli are helpful for
obtaining viable phenomenology. We also study the effects of hidden sector
gluinos. In some parts of parameter space these can be the dominant dark matter
component, while in others their abundance is much smaller than that of
glueballs. Finally, we show that heavy glueballs produced from energy in the
hidden sector prior to matter domination can have the correct relic abundance
if they are sufficiently long lived.
