Diversity of Fuzzy Dark Matter Solitons

TL;DR

This paper investigates the diversity of FDM soliton structures in the universe, analyzing how various gravitational effects influence their profiles, with a focus on the relative significance of different sources.

Contribution

It identifies and compares the impacts of different gravitational sources on FDM soliton diversity, highlighting the weak effect of gravitomagnetic fields.

Findings

Gravitomagnetic effects are negligible compared to other sources.

Central black holes significantly alter FDM soliton profiles.

Additional dense solitons and baryon backgrounds contribute to structural diversity.

Abstract

According to the Schr\"odinger-Poisson equations, fuzzy dark matter (FDM) can form a stable equilibrium configuration, the so-called FDM soliton. In principle, given the FDM particle mass, the profile of the FDM soliton is fixed. In practice, however, there is a great diversity of structures in the Universe. Possible causes of such diversity can lie in such sources as the gravitoelectric field due to a central supermassive black hole, the gravitomagnetic field due to the system angular momentum, an extra denser and compact FDM soliton and an ellipsoidal baryon background. We find that the effects of the gravitomagnetic field due to the soliton's self-angular momentum are very weak while those of the other sources are considerable.