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

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arxiv 1912.07064 v1 pith:6FDHUIVA submitted 2019-12-15 astro-ph.CO astro-ph.GA

Jens C. Niemeyer This is my paper · ORCID
classification astro-ph.COastro-ph.GA
keywords axiondarkmatterscalesaxion-likeformationfuzzyhalos
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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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Cited by 3 Pith papers

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  1. Anisotropic quantum polytropes

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    In pressureless quantum polytropes, positive pressure anisotropy compresses the structure and stronger gravity weakens binding, opposite to classical polytrope behavior.

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  3. Engineering a Digital Twin for the Monitoring and Control of Beer Fermentation Sampling

    cs.SE 2025-08 unverdicted novelty 4.0 of 10

    An experience report claims a Type 2 digital twin for beer fermentation reduces manual sampling time by 91% and enables control at seven bar.

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