PIRSA:25090042

Efficient Evolution of Self-Gravitating Spherical Dark-Matter Halos with and without New Physics

Sigurdson, K. (2025). Efficient Evolution of Self-Gravitating Spherical Dark-Matter Halos with and without New Physics. Perimeter Institute. https://pirsa.org/25090042

Sigurdson, Kris. Efficient Evolution of Self-Gravitating Spherical Dark-Matter Halos with and without New Physics. Perimeter Institute, Sep. 04, 2025, https://pirsa.org/25090042 

          @misc{ pirsa_PIRSA:25090042,
            doi = {10.48660/25090042},
            url = {https://pirsa.org/25090042},
            author = {Sigurdson, Kris},
            keywords = {Cosmology},
            language = {en},
            title = {Efficient Evolution of Self-Gravitating Spherical Dark-Matter Halos with and without New Physics},
            publisher = {Perimeter Institute},
            year = {2025},
            month = {sep},
            note = {PIRSA:25090042 see, \url{https://pirsa.org}}
          }

Kris Sigurdson University of British Columbia

Talk numberPIRSA:25090042
DOI10.48660/25090042
Collection
Talk Type Scientific Series
Subject

Abstract

We discuss NSphere, a new numerical algorithm for evolving spherically symmetric self-gravitating systems that reduces the six-dimensional phase space to three, providing orders-of-magnitude efficiency gains over full N-body methods. NSphere enables rapid exploration of halo evolution both in the collisionless case and when new physics, such as self-interacting dark matter (SIDM), is included. I will describe the method, its recent extension to SIDM, and applications to halos with anisotropic velocity distributions. These results show that anisotropy can alter gravothermal collapse timescales by more than a factor of two, underscoring the importance of velocity structure. For isotropic velocity distributions, our findings are consistent with existing work