  We propose a model for the dS/CFT correspondence. The model is constructed in
terms of a "Yang-Baxter operator" $R$ for unitary representations of the
deSitter group $SO(d,1)$. This $R$-operator is shown to satisfy the Yang-Baxter
equation, unitarity, as well as certain analyticity relations, including in
particular a crossing symmetry. With the aid of this operator we construct: a)
A chiral (light-ray) conformal quantum field theory whose internal degrees of
freedom transform under the given unitary representation of $SO(d,1)$. By
analogy with the $O(N)$ non-linear sigma model, this chiral CFT can be viewed
as propagating in a deSitter spacetime. b) A (non-unitary) Euclidean conformal
quantum field theory on ${\mathbb R}^{d-1}$, where $SO(d,1)$ now acts by
conformal transformations in (Euclidean) spacetime. These two theories can be
viewed as dual to each other if we interpret ${\mathbb R}^{d-1}$ as conformal
infinity of deSitter spacetime. Our constructions use semi-local generator
fields defined in terms of $R$ and abstract methods from operator algebras.
