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Fast radio bursts (FRBs) are a mysterious astrophysical phenomenon of brightpulses emitted at radio frequencies, and they are expected to be frequentlydetected in the future. The dispersion measures of FRBs are related tocosmological parameters, thus FRBs have the potential to be developed into anew cosmological probe if their data can be largely accumulated in the future.In this work, we study the capability of future FRB data to improvecosmological parameter estimation in two dynamical dark energy models. We findthat the simulated FRB data can break the parameter degeneracies inherent inthe current cosmic microwave background (CMB) data. Therefore, the combinationof the CMB and FRB data can significantly improve the constraints on the Hubbleconstant and dark energy parameters, compared to those using CMB or FRB alone.If 10,000 FRB events with known redshifts are detected in the future, theywould perform better than the baryon acoustic oscillation (BAO) data inbreaking the parameter degeneracies inherent in the CMB data. We also find thatthe combination of FRB and gravitational-wave (GW) standard siren data providesan independent low-redshift probe to verify the results from the CMB and BAOdata. For the data combination of CMB, GW, and FRB, it is found that the maincontribution to the constraints comes from the CMB and GW data, but theinclusion of the FRB data still can evidently improve the constraint on thebaryon density.

Cosmological parameter estimation for dynamical dark energy models with future fast radio burst observations