  Network properties govern the rate and extent of various spreading processes,
from simple contagions to complex cascades. Recently, the analysis of spreading
processes has been extended from static networks to temporal networks, where
nodes and links appear and disappear. We focus on the effects of
"accessibility", whether there is a temporally consistent path from one node to
another, and "reachability", the density of the corresponding "accessibility
graph" representation of the temporal network. The level of reachability thus
inherently limits the possible extent of any spreading process on the temporal
network. We study reachability in terms of the overall levels of temporal
concurrency between edges and the structural cohesion of the network
agglomerating over all edges. We use simulation results and develop
heterogeneous mean field model predictions for random networks to better
quantify how the properties of the underlying temporal network regulate
reachability.
