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, <math display="inline"><msub><mi>n</mi><mi>s</mi></msub></math>, as well as the tensor-to-scalar ratio, <math display="inline"><mi>r</mi></math>. These constrain the number of <math display="inline"><mrow><mi>e</mi></mrow></math>-folds of inflation, <math display="inline"><msub><mi>N</mi><mo>*</mo></msub></math>, the magnitude of the inflaton coupling to matter, <math display="inline"><mi>y</mi></math>, and the reheating temperature, <math display="inline"><msub><mi>T</mi><mrow><mi>reh</mi></mrow></msub></math>, which we evaluate in attractor models of inflation as formulated in no-scale supergravity. The 68% C.L. region of <math display="inline"><mo stretchy="false">(</mo><msub><mi>n</mi><mi>s</mi></msub><mo>,</mo><mi>r</mi><mo stretchy="false">)</mo></math> favors large values of <math display="inline"><msub><mi>N</mi><mo>*</mo></msub><mo>,</mo><mi>y</mi></math>, and <math display="inline"><msub><mi>T</mi><mrow><mi>reh</mi></mrow></msub></math> that are constrained by the production of gravitinos and supersymmetric dark matter.