Minimal Extensions of the $\alpha$-Starobinsky Model: Reconciling ACT DR6 and Reheating Constraints

Nehla Shobcha, Norma Sidik Risdianto, Romy Hanang Setya Budhi

The latest combined data from the Atacama Cosmology Telescope (ACT) DR6, Planck, and DESI yields a scalar spectral index $n_s=0.9743\pm 0.0034$, which lies approximately $2\sigma$ ab…