Inflationary “scorecard,” comparing the predictions of the simplest inflationary models with observations.
|A spatially flat universe||ΩK = 0.0007 ± 0.0019|
|with a nearly scale-invariant (red)|
|spectrum of density perturbations,||ns = 0.967 ± 0.004|
|which is almost a power law,||dn/dlnk = −0.0042 ± 0.0067|
|dominated by scalar perturbations,||r0.002 < 0.065|
|which are Gaussian||fNL = −0.9 ± 5.1|
|and adiabatic,||α−1 = 0.00013 ± 0.00037|
|with negligible topological defects||f < 0.01|
Notes. In all cases, the tightest observational limits come from Planck, sometimes in combination with other data sets (as described in the text). Here we quote symmetric, 68% CL uncertainties or 95% upper limits on each quantity, taken from Planck Collaboration XI (2016), Planck Collaboration IV (2020), Planck Collaboration IX (2020), and Planck Collaboration X (2020). All quantities have their usual meanings, with α−1 the amplitude of an isocurvature component to the fluctuations and the topological defect limit referring specifically to Nambu-Goto cosmic strings (see Table 8 of Planck Collaboration XI 2016, for other cases).
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