Exploration of simple scenarios involving Fuzzy Dark Matter cores and gas at local scales

TL;DR

This paper presents a numerical tool to study interactions between ultralight bosonic dark matter and gas, demonstrating its capabilities through simple merger scenarios and analyzing post-merger properties.

Contribution

The authors develop and validate a new numerical code to simulate coupled Schrödinger-Euler-Poisson systems for dark matter and gas interactions.

Findings

Code accurately models dark matter and gas dynamics.

Toy scenarios illustrate core-gas mergers and post-merger features.

Results show potential offsets and oscillation correlations between dark matter and gas.

Abstract

We introduce a tool that solves the Schr\"odinger-Euler-Poisson system of equations and allows the study of the interaction between ultralight bosonic dark matter, whose dynamics is described with the Schr\"odinger-Poisson system and luminous matter which, as a first approximation, is modeled with a single component compressible ideal fluid. The two matter fields are coupled through the Poisson equation, whose source is the addition of both, dark matter and fluid densities. We describe the numerical methods used to solve the system of equations and present tests for each of the two components, that show the accuracy and convergence properties of the code. As simple possible applications we present some toy scenarios: i) the merger between a core of dark matter with a cloud of gas, ii) the merger of bosonic dark matter plus fluid configurations, and iii) the post merger properties, including the dark-matter offset from gas and the correlation between oscillations of the bosonic core and those of the gas.