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2024

Soliton self-gravity and core-halo relation in fuzzy dark matter halos

Manita, Yusuke, Takahashi, Takuya, Taruya, Atsushi

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Fuzzy dark matter (FDM) is an attractive dark matter candidate composed of ultralight particles.

In this paper, toward a clear understanding of the core-halo relation in the FDM halos, we consider a simple model of the soliton-halo system, in which the self-gravitating soliton core is formed in the presence of Navarro-Frenk-White (NFW) halo potential as an external field.
Solving numerically the Schr\"odinger-Poisson equation, the self-gravitating soliton is obtained as a ground-state solution, which is characterized by the two key parameters, i.e., size of soliton core and its strength of self-gravity relative to those of the NFW halo.
Using our soliton-halo model, we investigate the properties of soliton cores found in cosmological simulation, and the key parameters characterizing these solitons are reconstructed in a self-consistent manner.

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