Entanglement entropy in de Sitter space

Understand

We compute the entanglement entropy for some quantum field theories on de Sitter space.

• We consider a superhorizon size spherical surface that divides the spatial slice into two regions, with the field theory in the standard vacuum state.
• First, we study a free massive scalar field.
• Then, we consider a strongly coupled field theory with a gravity dual, computing the entanglement using the gravity solution.