Why does Einasto profile index n similar to 6 occur so frequently?
- We consider the behavior of spherically symmetric Einasto halos composed of gravitating particles in the Fokker-Planck approximation. This approach allows us to consider the undesirable influence of close encounters in the N-body simulations more adequately than the generally accepted criteria. The Einasto profile with index n approximate to 6 is a stationary solution of the Fokker-Planck equation in the halo center. There are some reasons to believe that the solution is an attractor. Then the Fokker-Planck diffusion tends to transform a density profile to the equilibrium one with the Einasto index n approximate to 6. We suggest this effect as a possible reason why the Einasto index n approximate to 6 occurs so frequently in the interpretation of N-body simulation results. The results obtained cast doubt on generally accepted criteria of N-body simulation convergence.
Verfasserangaben: | Anton N. Baushev, M. V. BarkovORCiD |
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DOI: | https://doi.org/10.1088/1475-7516/2018/03/034 |
ISSN: | 1475-7516 |
Titel des übergeordneten Werks (Englisch): | Journal of cosmology and astroparticle physics |
Verlag: | IOP Publ. Ltd. |
Verlagsort: | Bristol |
Publikationstyp: | Wissenschaftlicher Artikel |
Sprache: | Englisch |
Datum der Erstveröffentlichung: | 20.03.2018 |
Erscheinungsjahr: | 2018 |
Datum der Freischaltung: | 14.01.2022 |
Freies Schlagwort / Tag: | dark matter theory; dwarfs galaxies; galaxy evolution; rotation curves of galaxies |
Ausgabe: | 3 |
Seitenanzahl: | 15 |
Fördernde Institution: | Helmholtz Alliance for Astroparticle Physics HAP - Initiative and Networking Fund of the Helmholtz Association; Japan Society for the Promotion of ScienceMinistry of Education, Culture, Sports, Science and Technology, Japan (MEXT)Japan Society for the Promotion of Science [16H00878]; NSFNational Science Foundation (NSF) [AST-1306672]; DoEUnited States Department of Energy (DOE) [DE-SC0016369] |
Organisationseinheiten: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
DDC-Klassifikation: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
Peer Review: | Referiert |
Publikationsweg: | Open Access / Green Open-Access |