Planck 2018 results
Free Access

Fig. 27.

image

Constraints on the running of the scalar spectral index in the ΛCDM model, using Planck TT,TE,EE+lowE+lensing when marginalizing over r (samples, coloured by the spectral index at k = 0.05 Mpc−1), and the equivalent result when r = 0 (black contours). The Planck data are consistent with zero running, but also allow for significant negative running, which gives a positive tilt ns, 0.002, and hence less power, on large scales (k ≈ 0.002 Mpc−1).

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