  Entanglement, chaos, and complexity are as important for de Sitter space as
for AdS and for black holes. There are similarities and great differences
between AdS and dS in how these concepts are manifested in the space-time
geometry. In the first part of this paper the Ryu-Takayanagi prescription, the
theory of fast scrambling, and the holographic complexity correspondence are
reformulated for de Sitter space. Criteria are proposed for a holographic model
to describe de Sitter space. The criteria can be summarized by the requirement
that scrambling and complexity growth must be "hyperfast." In the later part of
the paper I show that a certain limit of SYK is a concrete, computable,
holographic model of de Sitter space. Calculations are described which support
the conjecture.
