Planck 2015 results
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Table 15

95% CL upper bounds on the tensor-to-scalar ratio (actually the tensor-to-curvature power ratio) at the primordial time, r, and earlier, at the Hubble radius exit time during inflation, , at k = 0.05 Mpc-1.

Model (and data) r 0.05

CDI+r (TT+lowP) 0.086 0.089 0.041
ADI+r (TT+lowP) 0.101 0.101 0.048
CDI+r (TT, TE, EE+lowP) 0.092 0.092 0.043
ADI+r (TT, TE, EE+lowP) 0.094 0.094 0.044

Notes. In the pure adiabatic case r and are equal. In the last column indicates the tensor contribution to the temperature angular power at = 10 relative to the temperature power from scalar perturbations ().

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