GST theories linear in □R are dynamically equivalent to generalized hybrid f(R,ℛ) models via a shared Einstein-frame bi-scalar representation that supplies an explicit reconstruction dictionary.
Generalized sixth order gravity and inflation
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A connection between Gravitational Scalar-Tensor theories and Generalized Hybrid theories
GST theories linear in □R are dynamically equivalent to generalized hybrid f(R,ℛ) models via a shared Einstein-frame bi-scalar representation that supplies an explicit reconstruction dictionary.