  We describe connected timelike codim-2 extremal surfaces stretching between
the future and the past boundaries in the static patch coordinatization of de
Sitter space. These are analogous to rotated versions of certain surfaces in
the $AdS$ black hole. The existence of these surfaces via the $dS/CFT$
framework suggests the speculation that $dS_4$ is dual to two copies of
ghost-like CFTs in a thermofield-double-type entangled state. In studies of
entanglement in ghost systems and "ghost-spin" chains, we show that similar
entangled states in two copies of ghost-spin ensembles always have positive
norm and positive entanglement.

High Energy Physics - Theory;General Relativity and Quantum Cosmology