http://arxiv.org/abs/2205.07926
Fast Radio Bursts (FRBs) are millisecond-duration radio transients with an observed dispersion measure ($DM$) greater than the expected Milky Way contribution, which suggests that such events are of extragalactic origin. Although some models have been proposed to explain the physics of the pulse, the mechanism behind the FRBs emission still unknown. From FRBs data with known host galaxies, the redshift is directly measured and can be combined with estimates of the $DM$ to constrain the cosmological parameters, such as the baryon number density and the Hubble constant. However, the poor knowledge of the fraction of baryonic mass in the intergalactic medium ($f_{IGM}$) and its degeneracy with the cosmological parameters impose limits on the cosmological application of FRBs. In this work we present a model-independent method to determine the evolution of $f_{IGM}$, combining the latest FRBs observations with localized host galaxy and current supernovae data. In our analysis we consider constant and time-dependent $f_{IGM}$ parameterizations and show, through a Bayesian model selection analysis, that there is a strong evidence in favor of a growing evolution of $f_{IGM}$ with redshift.
T. Lemos, R. Gonçalves, J. Carvalho, et. al.
Wed, 18 May 22
33/66
Comments: 10 pages, 2 figures, latex