A5076390889- Cosmology and Gravitation Theories
- Dark Matter and Cosmic Phenomena
- Galaxies: Formation, Evolution, Phenomena
- Relativity and Gravitational Theory
- Black Holes and Theoretical Physics
- Geophysics and Sensor Technology
University of Auckland
2022-2024
Ultralight dark matter (ULDM) is usually taken to be a single scalar field. Here we explore the possibility that ULDM consists of $N$ light fields with only gravitational interactions. This configuration more consistent underlying particle physics motivations for these scenarios than ultralight halos have characteristic granular structure increases stellar velocity dispersion and can used as observational constraints on models. In multifield simulations, find inside halo amplitude total...
We numerically simulate the motion of a black hole as it plunges radially through an ultralight dark matter (ULDM) soliton. investigate timescale in which dynamical friction reduces kinetic energy to minimum and consider sensitivity this changes ULDM particle mass, total soliton mass hole. contrast our numerical results with semianalytic treatment find that latter is poorly suited scenario. In particular, we backreaction presence significant, resulting oscillations coefficient cannot be...
We simulate the gravitational dynamics of a massive object interacting with ultralight/fuzzy dark matter (ULDM/FDM), nonrelativistic quantum described by Schr\"odinger-Poisson equation. first consider point mass moving in uniform background, and then supermassive black hole (SMBH) within ULDM soliton. After replicating simple dynamical friction scenarios to verify our numerical strategies, we demonstrate that wake induced medium may undergo collapse dramatically increases drag force, albeit...
We numerically simulate the motion of a black hole as it plunges radially through an ultralight dark matter soliton. investigate timescale in which dynamical friction reduces kinetic energy to minimum, and consider sensitivity this changes ULDM particle mass, total soliton mass hole. contrast our numerical results with semi-analytic treatment friction, find that latter is poorly suited scenario. In particular, we back-reaction presence significant, resulting oscillations coefficient cannot...