Andrina tells us about her work using CAMELS and machine learning to constrain baryon feedback using the electron density power spectrum.

The electron density is not itself an observable thing, but it is a good proxy for observable things like the thermal Sunyaev Zeldovich effect and Fast Radio Burst dispersion (or they are good proxies for the electron density).

Andrina is able to get nice constraints on baryon feedback and cosmological parameters within the CAMELS simulations. This sort of observational probe of baryon feedback is going to be an important tool for cosmologists if we want to use smaller scales to do cosmology, and the sort of connections spotted by Andrina and CAMELS will be valuable for improving these probes.

Andrina: https://www.astro.princeton.edu/~anicola/
Paper: https://arxiv.org/abs/2201.04142

CAMELS playlist: https://youtu.be/6Vgc72a_VpY&list=PLvy7h0l2rJHq03inVPqYnC3llKt0IwwLT