Cosmological Structure Formation and Soliton Phase Transition in Fuzzy Dark Matter with Axion Self-Interactions
Cosmology and Nongalactic Astrophysics
2023-03-15 v1
Abstract
We investigate cosmological structure formation in Fuzzy Dark Matter (FDM) with an 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.
Keywords
Cite
@article{arxiv.2301.10266,
title = {Cosmological Structure Formation and Soliton Phase Transition in Fuzzy Dark Matter with Axion Self-Interactions},
author = {Philip Mocz and Anastasia Fialkov and Mark Vogelsberger and Michael Boylan-Kolchin and Pierre-Henri Chavanis and Mustafa A. Amin and Sownak Bose and Tibor Dome and Lars Hernquist and Lachlan Lancaster and Matthew Notis and Connor Painter and Victor H. Robles and Jesus Zavala},
journal= {arXiv preprint arXiv:2301.10266},
year = {2023}
}
Comments
10 pages, 3 figures, submitted to mnras