A New Method to Measure Hubble Parameter H(z) Using Fast Radio Bursts

Abstract

The Hubble parameter H ( z ) is directly related to the expansion of our universe. It can be used to study dark energy and constrain cosmology models. In this paper, we propose that H ( z ) can be measured using fast radio bursts (FRBs) with redshift measurements. We use dispersion measures contributed by the intergalactic medium, which is related to H ( z ), to measure the Hubble parameter. We find that 500 mocked FRBs with dispersion measures and redshift information can accurately measure Hubble parameters using Monte Carlo simulation. The maximum deviation of H ( z ) from the standard ΛCDM model is about 6% at redshift z  = 2.4. We also test our method using Monte Carlo simulation. A Kolmogorov–Smirnov (K-S) test is used to check the simulation. The p -value of the K-S test is 0.23, which confirms internal consistency of the simulation. In the future, more localizations of FRBs make it an attractive cosmological probe.