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Constraining Ultra Light Dark Matter with the Stellar Kinematics in the Galactic Centre

Toguz, Firat; (2023) Constraining Ultra Light Dark Matter with the Stellar Kinematics in the Galactic Centre. Doctoral thesis (Ph.D), UCL (University College London). Green open access

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Abstract

We use the stellar kinematics in the Milky Way’s Galactic centre to test the existence of a dark matter ‘soliton core’, as predicted in ultra-light dark matter (ULDM) models, which are currently an attractive model to resolve the small-scale problems of the cold dark matter model. We first use the Milky Way’s nuclear star cluster (NSC) to test the existence of the ULDM by applying a spherical isotropic Jeans model to fit the NSC line-of-sight velocity dispersion data, assuming priors on the precisely measured Milky Way’s supermassive black hole (SMBH) mass and the well-measured NSC density profile. We find that the current observational data reject the existence of a soliton core for a single ULDM particle with mass in the range 10^{-20.40} eV ≲ m_{DM} ≲ 10^{-18.50} eV, assuming that the soliton core structure is not affected by the Milky Way’s SMBH. We then fix the NSC as an external component and used Action-based Galaxy Modelling Architecture (AGAMA) package to model the nuclear stellar disk (NSD) to test the existence of a soliton core at a broader range of m_{DM}. We assess the existence of a soliton core in the centre of the Milky Way by fitting the surface density, mean line-of-sight velocity, and vertical velocity dispersion of the NSD stars. We use the surface density and proper motion data from the updated version of the VISTA Variables in the Vía Láctea Infrared Astrometric Catalogue data, and the line-of-sight velocities provided by Apache Point Galactic Evolution Experiment. We find that these observational data reject the ULDM particle mass range between 10^{-23.20} eV and 10^{-20.0} eV. Hence, combining the constraints from the NSC, we conclude that the current observational data reject the ULDM particle mass range from 10^{-23.20} eV and 10^{-18.50} eV. Overall, this work clearly indicates that a model explaining the dark matter as a single ULDM particle mass is not a viable solution to explain the nature of the dark matter in the Universe.

Type: Thesis (Doctoral)
Qualification: Ph.D
Title: Constraining Ultra Light Dark Matter with the Stellar Kinematics in the Galactic Centre
Open access status: An open access version is available from UCL Discovery
Language: English
Additional information: Copyright © The Author 2022. Original content in this thesis is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) Licence (https://creativecommons.org/licenses/by-nc/4.0/). Any third-party copyright material present remains the property of its respective owner(s) and is licensed under its existing terms. Access may initially be restricted at the author’s request.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/10184665
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