Speaker
Description
Uncertain modeling of baryonic feedback, how energy from active galactic nuclei and supernovae redistributes gas within and beyond halos, poses a major obstacle to testing the cosmological model with large-scale structure (LSS) probes that extend into the non-linear regime. Indeed, it represents the dominant source of uncertainty limiting the cosmological precision of weak lensing (WL).
In this talk, I will share work confronting this challenge by 1. demonstrating that astrophysical models calibrated by gas probes can recover this loss of power and 2. providing evidence that the impact of baryonic feedback on the matter distribution is stronger than assumed in cosmological hydrodynamical simulations, a conclusion that has been reinforced by the broader community. Whether such strong feedback is physically plausible, and how a consensus model can be achieved to fully exploit the cosmological precision of upcoming LSS surveys, remain open questions. I will outline a path forward: to use new, public multi-wavelength survey data to change our understanding of feedback processes and realize a next-generation hydrodynamical simulation and, in tandem, develop a data-driven baryonic feedback model to realize the full promise of next-generation WL cosmology.
| Other topic / keywords: | Baryonic feedback, weak gravitational lensing |
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