BICEP/Keck and Cosmological Attractors

TL;DR

This paper analyzes how recent BICEP/Keck data impacts inflationary models, highlighting cosmological attractors that fit all current data and can accommodate a wide range of tensor-to-scalar ratios, including those predicted by string theory.

Contribution

It demonstrates that cosmological attractor models remain compatible with all current observational data and can predict a broad spectrum of tensor-to-scalar ratios, including those within the reach of ongoing experiments.

Findings

Cosmological attractors can describe all current inflation data.

Models predict tensor-to-scalar ratio r down to zero.

Some models predict r between 10^{-3} and 10^{-2}.

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 $10^{-3} \leq r \leq 10^{-2}$. The upper part of this range can be explored by the ongoing BICEP/Keck observations.