Speaker
Dr
Andrei Mesinger
(Princeton Univerisity)
Description
I present a fast and powerful tool for calculating full 3D realizations of the high-redshift 21cm signal. We compare
our semi-numerical techniques against cosmological hydrodynamic simulations with radiative transfer, and find good
agreement in the nonlinear density, ionization, peculiar velocity, and the resulting 21cm emission fields, especially
on scales relevant to upcoming 21cm experiments. Interestingly, we also find that peculiar velocities have a
complex impact on the mean and power spectrum of the 21cm emission, which varies with scale and the global
ionized fraction. We also include prescriptions for computing inhomogenous X-ray heating and Lyman alpha
pumping. Our simulation boxes can be of arbitrary size and can be run on ordinary computers in a matter of
minutes. Thus they can rapidly explore wide swaths of parameter space, and be invaluable in interpreting upcoming
21cm observations.
Primary author
Dr
Andrei Mesinger
(Princeton Univerisity)
