Speaker
Description
In recent years, Fast Radio Bursts (FRBs) have been established as a direct probe of baryonic matter. They are tracing the integrated ionised electron density along the line of sight through their observed dispersion measures. Upcoming radio surveys, such as the DSA, CHORD and the SKA, are expected to deliver up to 100,000 additional events. Their direct sensitivity to the Universe’s baryon content allows FRBs to trace astrophysical processes that redistribute matter within and around galaxies. As a result, FRBs offer an alternative way to bridge astrophysics and cosmology, providing new constraints on feedback mechanisms that currently limit our ability to extract cosmological information from Stage IV surveys.
In this talk, I will briefly review the current status of large-scale structure cosmology and introduce FRBs as cosmological probes. I will discuss how FRBs can be used to test both the background expansion of the Universe and the distribution of baryons in the large-scale structure. Using a currently available sample of localised FRBs, I will present constraints on baryonic feedback and the suppression of the matter power spectrum, demonstrating that only 100 FRBs can distinguish between feedback models . Furthermore, I will address future prospects of FRB cosmology, outlining key challenges and systematic uncertainties. Finally, I will explore synergies with Stage IV surveys and discuss how FRBs can serve as a crucial external calibration for baryonic feedback, enhancing Stage IV’s cosmological fidelity.
| Other topic / keywords: | Baryonic feedback |
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