DJp.1.11 — Stochastic Evolution of Halo Spin

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Aug 4th at 6:00 PM until 6:00 PM

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Author(s): Juhan Kim1

Institution(s): 1. Korea Institute for Advanced Study

We will introduce an excursion set model for the evolution of halo spin from cosmological N-body simulations. A stochastic differential equation is derived from the definition of halo spin and the distribution of angular momentum changes are measured from simulations. The log-normal distribution of halo spin is found to be a natural consequence of the stochastic differential equation and the resulting spin distribution is found be a function of local environments, halo mass, and redshift.