摘要: In this paper, the modified gravity, which is characterized by the modified
factor $\mu$ in the linear matter density perturbation theory, is reconstructed
in a completely data-driven and model-independent way via Gaussian process by
using currently available cosmic observations, which consist Pantheon+ SNe Ia
samples, observed Hubble parameter $H(z)$ and the redshift space distortion
$f\sigma_8(z)$ data points. The reconstructed results suggest a time varying
$\mu$ at low redshifts. It also implies more complicated modified gravity
beyond the simplest general relativity and the Dvali-Gabadadze-Porrati
braneworld model is required.
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