4.7 Article

Cosmography from well-localized fast radio bursts

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OXFORD UNIV PRESS
DOI: 10.1093/mnras/stad2856

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intergalactic medium; fast radio bursts

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This study used cosmography to analyze a sample of 23 well-localized FRBs and estimated the kinematic parameters and Hubble constant. The study also found that FRBs can be used to explore the "Missing Baryons" problem in the universe.
Fast radio bursts (FRBs) are millisecond-duration pulses occurring at cosmological distances that have emerged as prominent cosmological probes due to their dispersion measure (DM) evolution with redshift. In this work, we use cosmography, a model-independent approach to describe the evolution of the Universe, to introduce the cosmographic expansion of the DM-z relation. By fitting two different models for the intergalactic medium and host contributions to a sample of 23 well-localized FRBs, we estimate the kinematic parameters q(0) = -0.59(-0.17)(+0.20), j(0) = 1.08(-0.56)(+0.62), s(0) = -2.1 +/- 7.0, and H-0 = 69.4 +/- 4.7 achieving a precision of 6 per cent and 7 per cent for the Hubble constant depending on the models used for contributions. Furthermore, we demonstrate that this approach can be used as an alternative and complementary cosmological model-independent method to revisit the long-standing 'Missing Baryons' problem in astrophysics by estimating that 82 per cent of the baryonic content of the Universe resides in the intergalactic medium, within 7 per cent and 8 per cent precision, according to the contribution models considered here. Our findings highlight the potential of FRBs as a valuable tool in cosmological research and underscore the importance of ongoing efforts to improve our understanding of these enigmatic events.

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