BICEP/Keck Constraints on Attractor Models of Inflation and Reheating

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*, the magnitude of the inflaton coupling to matter, y, and the reheating temperature, T_RH. We evaluate the number of e-folds N* numerically in attractor models of inflation (T-Models and E- Models). We show that the 68% C.L. region of (n_s, r) plane favors large values of N*, y, and T_RH, and these parameters are constrained by the production of gravitinos and supersymmetric dark matter. We also show the minimum reheating temperature that is compatible with Big Bang Nucleosynthesis (BBN). Finally, we discuss the impacts of the BICEP/Keck and other constraints on E- and T-Models of inflation.