The f2(T) term in separable f(R,T) gravity is shown to be a redefinition of the matter sector rather than new gravitational physics, invalidating prior observational constraints on its parameters.
Simi- larly, in [ 12] the ideal gas law is used, but this ideal gas law should be applied to the physical energy density and pressure, not the “bare” energy density and pressure
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Reexamining $f(R,T)$ gravity
The f2(T) term in separable f(R,T) gravity is shown to be a redefinition of the matter sector rather than new gravitational physics, invalidating prior observational constraints on its parameters.