A new cosmological probe using super-massive black hole shadows

Abstract

We study the prospects of using the low-redshift and high-redshift black hole shadows as new cosmological standard rulers for measuring cosmological parameters. We show that, using the low-redshift observation of the black hole shadow of M87${}^{\star }$, the Hubble constant can be independently determined with a precision of about $13\%$ as $H_0=70\pm 9$ km s${}^{-1}$ Mpc${}^{-1}$. The high-redshift observations of super-massive black hole shadows may accurately determine a combination of parameters $H_0$ and ${\Omega }_{\mathrm{m}}$, and we show by a simple simulation that combining them with the type Ia supernovae observations would give precise measurements of the cosmological parameters.

arXiv comment5 pages, 3 figures

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