Dynamical friction in rotating ultralight dark matter galactic cores

TL;DR

This paper investigates how dynamical friction in spiral galaxies is influenced by the vortex structure and self-interactions of rotating ultralight bosonic dark matter cores, revealing significant effects near galactic centers.

Contribution

It introduces the impact of vortex topological charge and self-interactions on dynamical friction in ultralight dark matter galactic cores, a novel aspect in dark matter modeling.

Findings

Dynamical friction force varies with vortex topological charge.

Self-interactions significantly influence dynamical friction.

Effects are strongest near the galactic center.

Abstract

Dynamical friction and stellar orbital motion in spiral galaxies with dark matter composed of ultralight bosons in the state of rotating Bose-Einstein condensate (BEC) are studied. It is found that the dynamical friction force is significantly affected by the topological charge of the vortex structure of the BEC core with the strongest effect at distances near the galactic center. It is also shown that the ultralight dark matter self-interaction plays an important role in studying the dynamical friction.