Fast Radio Bursts and cosmological tests

Abstract

We consider future cosmological tests based on observations of Fast Radio Bursts (FRBs). We use Illustris Simulation to realistically estimate the scatter in the dispersion measure (DM) of FRBs caused by the inhomogeneous distribution of ionized gas in the Intergalactic Medium (IGM). We find ~13% scatter in DM to a source at z=1 and ~7% at z=3 (one sigma). The distribution of DM is close to Gaussian. We simulate samples of FRBs and examine their applicability to simple cosmological tests. Our calculations show that using a sample of 100 FRBs and fixing cosmological model one can find the redshift and sample averaged fraction of ionized gas with ~1% uncertainty. Finding the ionized fraction with ~1% accuracy at few different epochs would require ~10 000 FRBs with known redshifts. Because DM is proportional to the product of ionized fraction, baryon density and the Hubble constant it is impossible to constrain these parameters separately with FRBs. Constraints on cosmological densities are possible in a flat LCDM model but give uninterestingly low accuracy. Using FRBs with other type of data improves the constraints, but the role of FRBs is not crucial. Thus constraints on the distribution of ionized gas are probably the most promising application of FRBs which allow for "tomography" if sources redshifts are known, as opposed to measuring electron scattering optical depth or S-Z y parameters with CMB observations.

8 pages, 5 figures, accepted by MNRAS

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• Commensal discovery of four Fast Radio Bursts during Parkes Pulsar Timing Array observations
• A New Method to Measure Hubble Parameter $H(z)$ using Fast Radio Bursts
• Fast radio bursts to be detected with the Square Kilometre Array
• The dispersion measure and scattering of FRBs: Contributions from the intergalactic medium, foreground halos, and hosts
• The dispersion measure of Fast Radio Bursts host galaxies: estimation from cosmological simulations
• Probing the baryon mass fraction in IGM and its redshift evolution with fast radio bursts using Bayesian inference method
• Fast Radio Burst Tomography of the Unseen Universe
• Constraining Fundamental Constants with Fast Radio Bursts: Unveiling the Role of Energy Scale
• A scaling relation in [C II]-detected galaxies and its likely application in cosmology
• 3D Localization of FRB 20190425A for Its Potential Host Galaxy and Implications