Holographic Fluctuations from Unitary de Sitter Invariant Field Theory
  We continue the study of inflationary fluctuations in Holographic Space Time
models of inflation. We argue that the holographic theory of inflation provides
a physical context for what is often called dS/CFT. The holographic theory is a
quantum theory which, in the limit of a large number of e-foldings, gives rise
to a field theory on $S^3$, which is the representation space for a unitary
representation of SO(1,4). This is not a conventional CFT, and we do not know
the detailed non-perturbative axioms for correlation functions. However, the
two- and three-point functions are completely determined by symmetry, and
coincide up to a few constants (really functions of the background FRW
geometry) with those calculated in a single field slow-roll inflation model.
The only significant deviation from slow roll is in the tensor fluctuations. We
predict zero tensor tilt and roughly equal weight for all three conformally
invariant tensor 3-point functions (unless parity is imposed as a symmetry). We
discuss the relation between our results and those of Maldacena, McFadden,
Skenderis, and others. Current data can be explained in terms of symmetries and
a few general principles, and is consistent with a large class of models,
including HST.
