Beschreibung
Fast Radio Bursts (FRBs) are very short transients bright enough to be detected at large cosmological distances. Their source is still unknown, but the radio pulse undergoes dispersion caused by free electrons associated with halos and the large-scale structure. This makes FRBs a sensitive probe of the baryon content in the Universe.
As the dispersion depends on the frequency, the cosmological expansion and redshift determines the overall strength of the pulse dispersion along the line of sight. In this talk, I will explain how a small number of currently known localised FRBs can be used to measure the overall baryon content and the expansion history. In the near future, correlation studies of FRBs allow a precise mapping of the cosmic baryon distribution. This will be crucial for most scales measured by stage IV lensing surveys, which are severely affected by baryonic physics.