English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

First simulations of axion minicluster halos

MPS-Authors
/persons/resource/persons16104

Dolag,  Klaus
Computational Structure Formation, MPI for Astrophysics, Max Planck Society;

External Ressource
No external resources are shared
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available
Citation

Eggemeier, B., Redondo, J., Dolag, K., Niemeyer, J. C., & Vaquero, A. (2020). First simulations of axion minicluster halos. Physical Review Letters, 125(4): 041301. doi:10.1103/PhysRevLett.125.041301.


Cite as: http://hdl.handle.net/21.11116/0000-0007-1907-6
Abstract
We study the gravitational collapse of axion dark matter fluctuations in the postinflationary scenario, so-called axion miniclusters, with N-body simulations. Largely confirming theoretical expectations, overdensities begin to collapse in the radiation-dominated epoch and form an early distribution of miniclusters with masses up to 10−12  M. After matter-radiation equality, ongoing mergers give rise to a steep power-law distribution of minicluster halo masses. The density profiles of well-resolved halos are Navarro–Frenk–White-like to good approximation. The fraction of axion dark matter in these bound structures is ∼0.75 at redshift z=100.