Université de GenèveDépartement de Physique ThéoriqueCAP Genève

Modeling neutral hydrogen (HI) at the field level

Date: 
28. April 2023 - 11:45
Speaker: 
Andrej Obuljen (University of Zurich)
Abstract: I will present results from our recent work on modeling neutral hydrogen (HI) at the field level (https://arxiv.org/abs/2207.12398). We use an analytical forward model based on perturbation theory to predict HI overdensity maps at low redshifts. We investigate its performance by comparing it directly at the field level to the simulated HI from the IllustrisTNG magneto-hydrodynamical simulation TNG300-1, in both real and redshift space. I will show results on the overall performance in terms of scales at which this approach accurately captures the simulated HI field and discuss the inferred HI noise properties. Finally, I will present Hi-Fi mocks — a simple prescription based on the perturbative forward model which can be used to efficiently generate HI mock data in real and redshift space, and discuss further applications.

Address

Département de Physique Théorique
Université de Genève
24, quai Ernest Ansermet
1211 Genève 4
Switzerland
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