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.
Author details: | Anton N. Baushev, M. V. BarkovORCiD |
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DOI: | https://doi.org/10.1088/1475-7516/2018/03/034 |
ISSN: | 1475-7516 |
Title of parent work (English): | Journal of cosmology and astroparticle physics |
Publisher: | IOP Publ. Ltd. |
Place of publishing: | Bristol |
Publication type: | Article |
Language: | English |
Date of first publication: | 2018/03/20 |
Publication year: | 2018 |
Release date: | 2022/01/14 |
Tag: | dark matter theory; dwarfs galaxies; galaxy evolution; rotation curves of galaxies |
Issue: | 3 |
Number of pages: | 15 |
Funding 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] |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
DDC classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
Peer review: | Referiert |
Publishing method: | Open Access / Green Open-Access |