Constraints on the exponential $f(R)$ model from latest Hubble parameter measurements

Understand

We investigate the viable exponential $f(R)$ gravity in the metric formalism with $f(R)=-\beta R_s (1-e^{-R/R_s})$.

• The latest sample of the Hubble parameter measurements with 23 data points is used to place bounds on this $f(R)$ model.
• A joint analysis is also performed with the luminosity distances of Type Ia supernovae and baryon acoustic oscillations in the clustering of galaxies, and the shift parameters from the cosmic microwave background measurements, which leads to $0.240<\Omega_m^0<0.296$ and $\beta>1.47$ at 1$\sigma$ confidence level.
• The evolutions of the deceleration parameter $q(z)$ and the effective equations of state $\omega_{de}^{eff}(z)$ and $\omega_{tot}^{eff}(z)$ are displayed.