  Maldacena has shown that the wavefunction of the universe in de Sitter space
can be viewed as the partition function of a conformal field theory. In this
paper, we investigate this approach to the dS/CFT correspondence in further
detail. We emphasize that massive bulk fields are dual to two primary operators
on the boundary, which encode information about the two independent behaviors
of bulk expectation values at late times. An operator statement of the duality
is given, and it is shown that the resulting boundary correlators can be
interpreted as transition amplitudes from the Bunch-Davies vacuum to an excited
state in the infinite future. We also explain how these scattering amplitudes
can be used to compute late-time Bunch-Davies expectation values, and comment
on the effects of anomalies in the dual CFT on such expectation values.
