2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/193238Using analytic expressions, we explore the parameter space for hilltop inflation models with a potential of the form $V_0\pm m^2ϕ^2 -aϕ^p$. With the positive sign and p>2 this converts the original hybrid inflation model into a hilltop model, allowing the spectral index to agree with the observed value n=0.95. In some cases the observed value is theoretically favored, while in others there is only the generic prediction $|n-1|\lsim 1$.12 pages, 25 figures, to appear in JCAPHigh Energy Physics - PhenomenologyAstrophysicsHigh Energy Physics - Theorytext