  We investigate the emergence of thermodynamic arrow of time in the context of
AdS/CFT correspondence. We show that, on the CFT side, if the two copies of the
field theory are not initially correlated the entropy can only increase such
that a definite orientation for the thermodynamic arrow of time is imposed.
Conversely, in a high-correlation environment, the entropy can either increase
or decrease, such that there is no opportunity for the dominance of one
direction of time over the other. On the gravity side, we construct the
structure of geometric dual by considering the notion of spacetime sidedness
and time-orientability. Accordingly, we conjecture that the entanglement of the
CFTs in the thermofield double state, impose the connection of the two sides of
the spacetime forming a one sided spacetime. In addition, disentangling the
degrees of freedom of the two CFTs, results in disconnecting the two sides of
the spacetime. In essence, the maximal entanglement between the two copies of
CFT builds, in the geometric dual, a connection between the two sides of
spacetime.
