Quantum Scales of Galaxies from Self-interacting Ultralight Dark Matter

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Quantum Scales of Galaxies from Self-interacting Ultralight Dark Matter

Jae-Weon Lee ^{1 ,*} , Chueng-Ryong Ji ^{2 ,*}

1 . Department of Electrical and Electronic Engineering, Jungwon University, 85 Munmu-ro, Goesan-eup, Goesan-gun, Chungcheongbuk-do, 28024, Korea.
2 . Department of Physics, North Carolina State University, Raleigh, North Carolina 27695-8202, USA.

* Authors to whom correspondence should be addressed.

Published in Journal of Fundamental and Observational Physics and Astrophysics ( Volume 1, Issue 1 )

Received: 30 June 2025 Accepted: 01 August 2025 Published: 23 August 2025

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Abstract

We derive the characteristic scales for physical quantities of dwarf galaxies, such as mass, size, acceleration, and angular momentum, within the self-interacting ultralight dark matter (ULDM) model. Due to the small mass of ULDM, even minor self-interactions can drastically alter these scales in the Thomas-Fermi limit. We suggest that these characteristic scales are connected to mysteries of observed galaxies. Oscillation of ULDM field can explain the current cosmological density of dark matter. Many cosmological constraints suggest that the energy scale m ̃ for self-interacting ULDM is typically of the order 10 eV , whereas the mass m for the non-interacting case is around 10−21 eV . Self-interacting ULDM provides the better explanation for cosmological observations than the non-interacting case.

Published in	Journal of Fundamental and Observational Physics and Astrophysics (Volume 1, Issue 1)
DOI	Registering/jfop4
Page(s)	9
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s). Published by Open Access Press

Keywords

Self-interacting Ultralight Dark Matter

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APA Style

Lee, J. J. , Ji, C. C. (2024). Quantum Scales of Galaxies from Self-interacting Ultralight Dark Matter. Journal of Fundamental and Observational Physics and Astrophysics, 1, (1), 1. https://doi.org/Registering/jfop4

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ACS Style

Lee, J. ; Ji, C. Quantum Scales of Galaxies from Self-interacting Ultralight Dark Matter. Mach. Learn. Res. (2024), 1, (1), 1. doi: https://doi.org/Registering/jfop4

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AMA Style

Lee , Ji . Quantum Scales of Galaxies from Self-interacting Ultralight Dark Matter. Mach Learn Res. (2024);1(1):1. doi: https://doi.org/Registering/jfop4

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