Fuzzy Aquarius: evolution of a Milky-way like system in the Fuzzy Dark Matter scenario

Abstract

We present the first high-resolution zoom-in simulation of a Milky-way-like halo extracted from the Aquarius Project in the Fuzzy Dark Matter (FDM) framework. We use the N-body code AX-GADGET, based on a particle oriented solution of the Schrödinger-Poisson equations, able to detail the complexity of structure formation while keeping track of the quantum effects in FDM. The halo shows a cored density profile, with a core size of several kpc for a FDM mass of $m_{\chi }=2.5h\times 10^{-22}\mathrm{eV}/c^2$. A flattening is observed also in the velocity profile, representing a distinct feature of FDM dynamics. We provide a quantitative analysis of the impact of fuzziness on satellites in terms of abundance, mass, distance and velocity distribution functions and their evolution with redshift. Very interestingly, we show that all collapsed structures, despite showing a flat density profile at $z=0$, do not reach the solitonic ground-state at the time of formation: on the contrary, they asymptotically converge to it on a timescale that depends on their mass and formation history. This implies that current limits on FDM mass - obtained by applying simple scaling relations to observed galaxies - should be taken with extreme care, since single objects can significantly deviate from the expected asymptotic behavior during their evolution.

14 pages, 9 figures. Submitted to MNRAS

References in corpus (18)

• Ultralight scalars as cosmological dark matter
• Dark Matter Candidates from Particle Physics and Methods of Detection
• Cosmic Structure as the Quantum Interference of a Coherent Dark Wave
• Searching for Dark Matter Annihilation in Recently Discovered Milky Way Satellites with Fermi-LAT
• A search for ultra-light axions using precision cosmological data
• Ultra-Light Dark Matter
• The Tidal Evolution of Local Group Dwarf Spheroidals
• Dark Matter Substructure in Numerical Simulations: A Tale of Discreteness Noise, Runaway Instabilities, and Artificial Disruption
• Resonant detection of axion mediated forces with Nuclear Magnetic Resonance
• Discreteness effects in simulations of Hot/Warm dark matter
• Structure formation in large-volume cosmological simulations of fuzzy dark matter: Impact of the non-linear dynamics
• Proper Motions, Orbits, and Tidal Influences of Milky Way Dwarf Spheroidal Galaxies
• The asymptotic tidal remnants of cold dark matter subhalos
• Scaling relations of Fuzzy Dark Matter haloes I: individual systems in their cosmological environment
• Design and Implementation of the ABRACADABRA-10 cm Axion Dark Matter Search
• Core-halo mass relation of ultralight axion dark matter from merger history
• Creating a galaxy lacking dark matter in a dark matter dominated universe
• The spatial distribution of Milky Way satellites, gaps in streams and the nature of dark matter

Cited by in corpus (5)

• Ultra-light axions and the $S_8$ tension: joint constraints from the cosmic microwave background and galaxy clustering
• On the Dynamical Heating of Dwarf Galaxies in a Fuzzy Dark Matter Halo
• COZMIC. I. Cosmological Zoom-in Simulations with Initial Conditions Beyond Cold Dark Matter
• Anticipating the XRISM search for the decay of resonantly produced sterile neutrino dark matter
• Fuzzy dark matter simulations