Algebraic conditions on background derivatives of f eliminate the massive spin-2 ghost from Ricci-squared terms in extended hybrid metric-Palatini gravity, leaving only healthy scalar modes.
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On the Ghost-Free Conditions of Extended Hybrid Metric-Palatini Gravity with Ricci-Squared Invariants
Algebraic conditions on background derivatives of f eliminate the massive spin-2 ghost from Ricci-squared terms in extended hybrid metric-Palatini gravity, leaving only healthy scalar modes.