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Cosmological structure formation and soliton phase transition in fuzzy dark matter with axion self-interactions

Mocz, Philip; Fialkov, Anastasia; Vogelsberger, Mark; Boylan-Kolchin, Michael; Chavanis, Pierre-Henri; Amin, Mustafa A; Bose, Sownak; Dome, Tibor; Hernquist, Lars; Lancaster, Lachlan; Notis, Matthew; Painter, Connor; Robles, Victor H; Zavala, Jesús

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Authors

Philip Mocz

Anastasia Fialkov

Mark Vogelsberger

Michael Boylan-Kolchin

Pierre-Henri Chavanis

Mustafa A Amin

Tibor Dome

Lars Hernquist

Lachlan Lancaster

Matthew Notis

Connor Painter

Victor H Robles

Jesús Zavala



Abstract

We investigate cosmological structure formation in fuzzy dark matter (FDM) with the attractive self-interaction (SI) with numerical simulations. Such a SI would arise if the FDM boson were an ultra-light axion, which has a strong CP symmetry-breaking scale (decay constant). Although weak, the attractive SI may be strong enough to counteract the quantum ‘pressure’ and alter structure formation. We find in our simulations that the SI can enhance small-scale structure formation, and soliton cores above a critical mass undergo a phase transition, transforming from dilute to dense solitons.

Citation

Mocz, P., Fialkov, A., Vogelsberger, M., Boylan-Kolchin, M., Chavanis, P., Amin, M. A., …Zavala, J. (2023). Cosmological structure formation and soliton phase transition in fuzzy dark matter with axion self-interactions. Monthly Notices of the Royal Astronomical Society, 521(2), 2608-2615. https://doi.org/10.1093/mnras/stad694

Journal Article Type Article
Acceptance Date Feb 28, 2023
Online Publication Date Mar 6, 2023
Publication Date 2023-05
Deposit Date May 11, 2023
Publicly Available Date May 11, 2023
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 521
Issue 2
Pages 2608-2615
DOI https://doi.org/10.1093/mnras/stad694

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