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A supersymmetric hybrid inflation framework is employed to realize a class ofnon-minimal inflation models with $U(1)_R \times Z_n$ global symmetry. Thisframework naturally incorporates models based on grand unified theories byavoiding the most commonly faced monopole problem. The predictions ofinflationary observables, the scalar spectral index $n_s = 0.960-0.966$ and thetensor to scalar ratio $r=0.0031-0.0045$, are in perfect agreement with thePlanck 2018 data. For sub-Planckian values of the field the $Z_n$ symmetry isonly allowed for $n\leq 4$.

Nonminimal Inflation in Supersymmetric GUTs with $U(1)_R \times Z_n$ Symmetry