A new cosmological probe using super-massive black hole shadows *

Abstract

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 , the Hubble constant can be independently determined with a precision of about 13% as km . The high-redshift observations of super-massive black hole shadows may accurately determine a combination of parameters and , and we show by a simple simulation that combining them with the type Ia supernovae observations would give precise measurements of the cosmological parameters.

Topics & Concepts