Testing Predictions of the Quantum Landscape Multiverse 2: The
  Exponential Inflationary Potential
  The 2015 Planck data release tightened the region of the allowed inflationary
models. Inflationary models with convex potentials have now been ruled out
since they produce a large tensor to scalar ratio. Meanwhile the same data
offers interesting hints on possible deviations from the standard picture of
CMB perturbations. Here we revisit the predictions of the theory of the origin
of the universe from the landscape multiverse for the case of exponential
inflation, for two reasons: firstly to check the status of the anomalies
associated with this theory, in the light of the recent Planck data; secondly,
to search for a counterexample whereby new physics modifications may bring
convex inflationary potentials, thought to have been ruled out, back into the
region of potentials allowed by data. Using the exponential inflation as an
example of convex potentials, we find that the answer to both tests is
positive: modifications to the perturbation spectrum and to the Newtonian
potential of the universe originating from the quantum entanglement, bring the
exponential potential, back within the allowed region of current data; and, the
series of anomalies previously predicted in this theory, is still in good
agreement with current data. Hence our finding for this convex potential comes
at the price of allowing for additional thermal relic particles, equivalently
dark radiation, in the early universe.
