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

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Niemeyer, Jens C.·2020·Progress in Particle and Nuclear Physics

Abstract

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.

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Metadata

Authors
Niemeyer, J. C.
Venue
Progress in Particle and Nuclear Physics
Publisher
Elsevier BV
Published
2020-07
Volume
113
Pages
103787
ISSN
0146-6410 (ISSN-L)
OpenAlex
W3015789127
Cited by
162
References
5
FWCI
11.22
Type
journal article
Language
en
Open access
green

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Niemeyer, J. C. (2020). Small-scale structure of fuzzy and axion-like dark matter. Progress in Particle and Nuclear Physics. https://doi.org/10.1016/j.ppnp.2020.103787

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