Kavli Affiliate: Mark Vogelsberger
| First 5 Authors: Wenzer Qin, Katelin Schutz, Olivia Rosenstein, Stephanie O’Neil, Mark Vogelsberger
| Summary:
We show that perturbative techniques inspired by effective field theory (EFT)
can be used to "paint on" the 21~cm field during reionization using only the
underlying linear density field. This procedure is accurate to within O(10%) on
large scales and thus can be used to enlarge or "supersize" hydrodynamical
simulations. In particular, the EFT provides a mapping between the linear
density field and a nonlinear tracer field, both in real and redshift space. We
show that this mapping can be reliably extracted from relatively small
simulation volumes using the THESAN suite of simulations, which have a comoving
volume of (95.5 Mpc)^3. Specifically, we show that if we fit the EFT
coefficients in a small ~5% sub-volume of the simulation, we can accurately
predict the 21cm field in the rest of the simulation given only the linear
density field. We show that our technique is robust to different models of dark
matter and differences in the sub-grid reionization modeling.
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