BICEP/<i>Keck</i> constraints on attractor models of inflation and reheating
John Ellis, Marcos A. G. García, Dimitri V. Nanopoulos, Keith A. Olive, Sarunas Verner
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, ${N}_{*}$, 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 $({n}_{s},r)$ favors large values of ${N}_{*},y$, and ${T}_{\mathrm{reh}}$ that are constrained by the production of gravitinos and supersymmetric dark matter.