Symmetries of the Primordial Sky
  Quantum field theory, which is generally used to describe the origin of
large-scale gravitational perturbations during cosmic inflation, has been shown
to omit an important physical effect in curved space-time, the nonlocal
entanglement among quantized modes from their gravitational effect on causal
structure. It is argued here that in a different model of quantum gravity that
coherently preserves nonlocal directional and causal relationships, primordial
perturbations originate instead from coherent quantum distortions of emergent
inflationary horizons; and moreover, that causal constraints account for
approximate symmetries of cosmic microwave background correlations measured at
large angular separations, which are highly anomalous in the standard picture.
Thus, symmetries already apparent in the large-angle CMB pattern may be unique
signatures of the emergence of locality and causal structure from quantum
gravity.
