Fermion-Boson Stars as Attractors in Fuzzy Dark Matter and Ideal Gas Dynamics

TL;DR

This paper investigates how fermion-boson star cores form in fuzzy dark matter models with an ideal gas, showing they act as attractors during structure formation, which could relate to luminous matter in galaxies.

Contribution

It demonstrates that fermion-boson stars serve as attractor solutions in the coupled FDM and ideal gas system, advancing understanding of core formation in dark matter models.

Findings

Fermion-boson stars form as nearly relaxed, virialized cores.

These cores act as attractors in the evolution of FDM with an ideal gas.

Results suggest relevance to luminous matter in galaxy formation.

Abstract

In the context of Fuzzy Dark Matter (FDM) we study the core formation in the presence of an Ideal Gas (IG). Our analysis is based on the solution of the Schr\"odinger-Poisson-Euler system of equations that drives the evolution of FDM together with a compressible IG, both coupled through the gravitational potential they produce. Starting from random initial conditions for both FDM and IG, we study the evolution of the system until it forms a nearly relaxed, virialized and close to hydrostatic equilibrium core, surrounded by an envelope of the two components. We find that the core corresponds to Newtonian Fermion-Boson Stars (FBS). If the IG is used to model luminous matter, our results indicate that FBS behave as attractor core solutions of structure formation of FDM along with visible matter.