A two-parameter hyperbolic expansion history in f(R,L_m)=R/2+L_m^alpha gravity fits late-time Hubble, supernova, and BAO data and produces a freezing, quintessence-like equation of state with stable sound speed.
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Observational constraints on freezing quintessence in a non-linear $f(R, L_m)$ gravity
A two-parameter hyperbolic expansion history in f(R,L_m)=R/2+L_m^alpha gravity fits late-time Hubble, supernova, and BAO data and produces a freezing, quintessence-like equation of state with stable sound speed.