Comments on entanglement entropy in the dS/CFT correspondence

We consider the entanglement entropy in the dS/CFT correspondence. In Einstein gravity on de Sitter spacetime we propose the holographic entanglement entropy as the analytic continuation of the extremal surface in Euclidean anti--de Sitter spacetime. Even though dual conformal field theories for Einstein gravity on de Sitter spacetime are not known yet, we analyze the free $Sp(N)$ model dual to Vasiliev's higher spin gauge theory as a toy model. In this model we confirm the behavior similar to our holographic result from Einstein gravity.