Angular correlation function measured with Planck (dark solid curve) (Planck Collaboration XII 2014), and associated 1σ errors(grey), compared with the prediction of the conventional inflationary Λ CDM (blue). In this model one assumes that umin = 0 and then optimizes C2 using the power spectrum in Fig. 1. The red curve shows the prediction of truncated inflation, or a non-inflationary cosmology, with an optimized lower limit umin = 4.34 and C2 = 235.14.
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