BICEP/Keck and Cosmological Attractors

Abstract

We discuss implications of the latest BICEP/Keck data release for inflationary models, with special emphasis on the cosmological attractors which can describe all presently available inflation-related observational data. These models are compatible with any value of the tensor to scalar ratio $r$, all the way down to $r=0$. Some of the string theory motivated models of this class predict $10^{-3}\le r\le 10^{-2}$. The upper part of this range can be explored by the ongoing BICEP/Keck observations.

14 pages, 10 figures. A figure added with a comparison of the new constraints on r and $n_s$ given in 2112.07961 and predictions of $\hat{I}\pm$-attractors