How dense are the densest dark matter haloes?

Chiamaka Okoli

Congratulations to my PhD student, Chiamaka Okoli, on her first paper being accepted for publication in Monthly Notice of Royal Astronomical Society.

Chiamaka has shown that you can use the simple idea of energy conservation, combined with knowing when an ellipsoid collapses, to predict how dense (and hot) a dark matter halo will be when it forms.  Previously, people had to rely on numerical simulations, and ad hoc extrapolations and fitting functions, which often led to contradictory conclusions for the densest dark matter haloes. However, her method is more robust, easy to use, and elegant (and I am in no way biased 🙂 ) ! You can also apply it to any cosmology or initial conditions.

Read more here. 


Concentration of dark matter haloes, across 20 orders of magnitude in mass