Jordan-frame multi-scalar-tensor gravity admits an Eckart-like first-order thermodynamic description whose heat flux and residual gradient sector are not generically reducible to a single KT-type quantity.
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Generalized hybrid metric-Palatini gravity propagates a massless spin-2 mode and two massive scalars in the weak field; stability requires algebraic conditions on f derivatives at flat space, and planetary data constrain the scalar masses in a hierarchical regime.
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First-order thermodynamics of multi-scalar-tensor gravity
Jordan-frame multi-scalar-tensor gravity admits an Eckart-like first-order thermodynamic description whose heat flux and residual gradient sector are not generically reducible to a single KT-type quantity.
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Another Look at the Weak-Field Limit of Generalized Hybrid Metric-Palatini Gravity
Generalized hybrid metric-Palatini gravity propagates a massless spin-2 mode and two massive scalars in the weak field; stability requires algebraic conditions on f derivatives at flat space, and planetary data constrain the scalar masses in a hierarchical regime.