Exploration of simple scenarios involving fuzzy dark matter cores and gas at local scales

Abstract

ABSTRACT We introduce a tool that solves the Schrödinger–Euler–Poisson system of equations and allows the study of the interaction between ultralight bosonic dark matter, whose dynamics is described with the Schrödinger–Poisson system and luminous matter which, as a first approximation, is modelled 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, which 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.