Small-scale structure of fuzzy and axion-like dark matter

Autor:	Niemeyer, Jens C.
Rok vydání:	2019
Předmět:	Astrophysics - Cosmology and Nongalactic Astrophysics Astrophysics - Astrophysics of Galaxies
Druh dokumentu:	Working Paper
DOI:	10.1016/j.ppnp.2020.103787
Popis:	Axion-like particle (ALP) dark matter shows distinctive behavior on scales where wavelike effects dominate over self-gravity. Ultralight axions are candidates for fuzzy dark matter (FDM) whose de Broglie wavelength in virialized halos reaches scales of kiloparsecs. Important features of FDM scenarios are the formation of solitonic halo cores, suppressed small-scale perturbations, and enhanced gravitational relaxation. More massive ALPs, including the QCD axion, behave like CDM on galactic scales but may be clumped into axion miniclusters if they were produced after inflation. Just as FDM halos, axion miniclusters may host the formation of coherent bound objects (axion stars) by Bose-Einstein condensation. This article presents a selection of topics in this field that are currently under active investigation. Comment: To be published in Progress in Particle and Nuclear Physics 2020
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1912.07064 Zobrazit plný text záznamu View this record from Arxiv