  In this essay I argue that the Hilbert space of states dual to a traversable
wormhole is smaller than the tensor product of the independent Hilbert spaces
of the boundary field theories. From the point of view of semiclassical
physics, the decrease in the number of states is perceived as an emergent,
non-local interaction stabilizing the wormhole. This presents new possibilities
for models of radiating black holes and raises questions about results
established under the spell of the tensor product.
