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Then

P. A. R. Ade et al
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2016
Later among the works it cites.
P. A. R. Ade et al
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2016
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2017
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2019

Constraints on Scalar and Tensor spectra from $N_{eff}$

Ben-Dayan, Ido, Keating, Brian, Leon, David et al.

Understand

At the linear level, the gravitational wave (GW) spectrum predicted by inflation, and many of its alternatives, can have arbitrarily small amplitude and consequently an unconstrained tilt.

However, at second order, tensor fluctuations are sourced by scalar fluctuations that have been measured in the cosmic microwave background (CMB).
These second order fluctuations generically produce a minimum amount of tensor perturbations corresponding to a tensor-to-scalar ratio of $r\sim 10^{-6}$.
Inverting this relationship yields a bound on the tensor tilt sourced by scalar fluctuations.