Formation and structure of ultralight bosonic dark matter halos

By J. Veltmaat, Jens C. Niemeyer, B. Schwabe. Physical Review D, 2018

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We simulate the formation and evolution of ultralight bosonic dark matter halos from cosmological initial conditions. Using zoom-in techniques we are able to resolve the detailed interior structure of the halos. We observe the formation of solitonic cores and confirm the core-halo mass relation previously found by Schive et al. The cores exhibit strong quasi-normal oscillations that remain largely undamped on evolutionary timescales. On the other hand, no conclusive growth of the core mass by condensation or relaxation can be detected. In the incoherent halo surrounding the cores, the scalar field density profiles and velocity distributions show no significant deviation from collisionless N-body simulations on scales larger than the coherence length. Our results are consistent with the core properties being determined mainly by the coherence length at the time of virialization, whereas the Schr\"odinger-Vlasov correspondence explains the halo properties when averaged on scales greater than the coherence length.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/a9e8789e4f31c990d94bb6410dd4750d6e2302ee

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Citations in the corpus

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CMB-S4 Science Case, Reference Design, and Project Plan (2019, result): “Realizing this sensitivity will require better modeling of the non-linear clustering of axions [315], building upon and applying the results of previous work [316, 317, 318, 319, 320, 321, 322, 323, 324, 325, 326, 327, 328, 329, 330, 331, 332].”