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Angular momentum evolution can be predicted from cosmological initial conditions | | Corentin Cadiou
; Andrew Pontzen
; Hiranya V. Peiris
; | | Date: |
3 Dec 2020 | | Abstract: | The angular momentum of dark matter haloes controls their spin magnitude and
orientation, which in turn influences the galaxies therein. However, the
process by which dark matter haloes acquire angular momentum is not fully
understood. We present an extension to the genetic modification technique which
allows us to control the angular momentum of any region in the initial
conditions. Using a suite of simulations, we investigate whether changes to the
angular momentum of a specified region in the evolved Universe can be
accurately predicted from changes in the initial conditions. We find that the
angular momentum in regions with modified initial conditions can be predicted
significantly more accurately than expected from applying tidal torque theory.
This result is masked when analysing the angular momentum of haloes, because
particles in the outskirts of haloes dominate the angular momentum budget. We
conclude that the angular momentum of Lagrangian patches is highly predictable
from the initial conditions, with apparent stochastic or chaotic behaviour
being driven by halo membership criteria. | | Source: | arXiv, 2012.02201 | | Services: | Forum | Review | PDF | Favorites | |
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