Seminário 12 de maio de 2026

Título: Constraining the Cosmic Baryon Density from Fast Radio Bursts with a Non-Parametric Reconstruction of the Hubble Parameter

Palestrante: Dr. Klécio Emanuel Lima de Farias , Pós-doc – UAF/UFCG.

http://lattes.cnpq.br/4228589176145316

Local e data: Auditório Jurgen Precker, 12 de maio de 2026, às 16:00h

Resumo: Fast radio bursts (FRBs) provide a promising tool to investigate the baryonic content of the Universe through their dispersion measures. In this work, we constrain the baryon density parameter Ω_b h² using a sample of 130 localized FRBs combined with a non-parametric reconstruction of the Hubble parameter H(z) obtained from cosmic chronometer data through the ReFANN neural-network framework. Within a Bayesian analysis, we simultaneously infer the baryon density and the host-galaxy contribution to the FRB dispersion measure. For the real FRB sample, we obtain Ω_b h² = 0.02236 ± 0.00090, in excellent agreement with Planck and Big Bang Nucleosynthesis results. We also explore the potential of future observations through a mock catalog of 2000 FRBs, showing that upcoming surveys may achieve sub-percent precision on the baryon density. Our results demonstrate that FRBs constitute a robust and complementary late-time cosmological probe.

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