Kavli Affiliate: Mark Vogelsberger
| First 5 Authors: Vinh Tran, Xuejian Shen, Mark Vogelsberger, Daniel Gilman, Stephanie O’Neil
| Summary:
We present a novel analytic density profile for halos in self-interacting
dark matter (SIDM) models, which accurately captures the isothermal-core
configuration, i.e. where both the density and velocity dispersion profiles
exhibit central plateaus in the halo innermost region. Importantly, the profile
retains a simple and tractable functional form. We demonstrate analytically how
our density profile satisfies the aforementioned conditions, with comparisons
to other contemporary functional choices. We further validate the profile using
idealized N-body simulations, showing that it provides excellent
representations of both the density and velocity dispersion profiles across a
broad range of evolutionary stages, from the early thermalization phase to the
late core-collapse regime. As a result of its accuracy and simplicity, the
proposed profile offers a robust framework for analyzing halo evolution in a
variety of SIDM scenarios. It also holds practical utility in reducing
simulation needs and in generating initial conditions for simulations targeting
the deep core-collapse regime.
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