Institute for Advanced Study Informal Astrophysics Seminar

In this talk I will cover two topics. First, I will talk about how to use large-scale structure data to search for light relics with small (but finite) masses, such as neutrinos. These particles are known to suppress the matter fluctuations at small scales, which can be observed in galaxy power spectra. This suppression is, however, partially compensated by an increase in the galaxy bias at the same scales, also induced by the presence of light relics. I will describe the code RelicFast, which efficiently and accurately computes this bias, and how to use it to find light relics and neutrinos with galaxy data. Second, I will describe how cross correlating observations of Fast Radio Bursts and Sunyaev-Zeldovich maps can uncover the location of the missing baryons in our Universe. By jointly measuring the warm-hot intergalactic medium, albeit with different thermal weights, these two observables will teach us about the location and thermal state of the low-redshift baryons.