BICEP/Keck Constraints on Attractor Models of Inflation and Reheating

Abstract

Recent BICEP/Keck data on the cosmic microwave background, in combination with previous WMAP and Planck data, impose strong new constraints on the tilt in the scalar perturbation spectrum, $n_s$, as well as the tensor-to-scalar ratio, $r$. These constrain the number of e-folds of inflation, $N_{\ast }$, the magnitude of the inflaton coupling to matter, $y$, and the reheating temperature, $T_{\mathrm{reh}}$, which we evaluate in attractor models of inflation as formulated in no-scale supergravity. The 68% C.L. region of $(n_s,r)$ favours large values of $N_{\ast },y$ and $T_{\mathrm{reh}}$ that are constrained by the production of gravitinos and supersymmetric dark matter.

Comments: v1: 9 pages, 2 figures. v2: 10 pages, 3 figures, added discussion of constraints of 2112.07961. v3: matches published version