FRBs and Emerging Probes Synergistically Constrain Hubble Constant and Baryon Density

The study highlights the potential of combining fast radio bursts (FRBs) with other emerging cosmological probes to simultaneously constrain the Hubble constant (H0) and the cosmic baryon density (Ωb). The inherent degeneracy between H0 and Ωb when using FRBs alone necessitates the use of complementary probes with different degeneracy directions in the H0-Ωb plane. The proposed multi-messenger approaches, including FRBs paired with gravitational wave (GW) standard sirens, strong gravitational lensing (SGL) time delays, and 21 cm intensity mapping (IM) surveys, offer a promising solution to this problem. The projected precision levels for these combinations, particularly in the ΛCDM model, are remarkable, suggesting that these approaches could provide definitive measurements of H0 and Ωb. The robustness of these constraints in a model-independent framework further strengthens the case for their utility. However, it is important to acknowledge the potential for systematic uncertainties in the different probes and the reliance on specific cosmological models, which could introduce biases in the results. Future research should focus on mitigating these uncertainties and exploring the implications of these measurements for our understanding of dark energy and the universe's expansion history.

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