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We study the prospects of using the low-redshift and high-redshift black holeshadows as new cosmological standard rulers for measuring cosmologicalparameters. We show that, using the low-redshift observation of the black holeshadow of M87$^\star$, the Hubble constant can be independently determined witha precision of about $13\%$ as $H_0=70\pm 9$ km s$^{-1}$ Mpc$^{-1}$. Thehigh-redshift observations of super-massive black hole shadows may accuratelydetermine a combination of parameters $H_0$ and ${\Omega_{\rm m}}$, and we showby a simple simulation that combining them with the type Ia supernovaeobservations would give precise measurements of the cosmological parameters.

A new cosmological probe using super-massive black hole shadows