Oscillations and random walk of the soliton core in a fuzzy dark matter halo
| Autor: | Xinyu Li, Tomer D. Yavetz, Lam Hui |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Physics
Cosmology and Nongalactic Astrophysics (astro-ph.CO) 010308 nuclear & particles physics FOS: Physical sciences Astrophysics::Cosmology and Extragalactic Astrophysics Random walk Astrophysics - Astrophysics of Galaxies 7. Clean energy 01 natural sciences Dark matter halo Superposition principle Normal mode Astrophysics of Galaxies (astro-ph.GA) Excited state Quantum electrodynamics 0103 physical sciences Halo Soliton 010306 general physics Ground state Astrophysics::Galaxy Astrophysics Astrophysics - Cosmology and Nongalactic Astrophysics |
| Zdroj: | Physical Review D. 103 |
| ISSN: | 2470-0029 2470-0010 |
| DOI: | 10.1103/physrevd.103.023508 |
| Popis: | A Fuzzy Dark Matter (FDM) halo consists of a soliton core close to the center and an NFW-like density profile in the outer region. Previous investigations found that the soliton core exhibits temporal oscillations and random walk excursions around the halo center. Analyzing a set of numerical simulations, we show that both phenomena can be understood as the results of wave interference -- a suitable superposition of the ground (solitonic) state and excited states in a fixed potential suffices to account for the main features of these phenomena. Such an eigenmode analysis can shed light on the evolution of a satellite halo undergoing tidal disruption. As the outer halo is stripped away, reducing the amplitudes of the excited states, the ground state evolves adiabatically. This suggests diminished soliton oscillations and random walk excursions, an effect to consider in deducing constraints from stellar heating. Comment: 9 pages, 12 figures |
| Databáze: | OpenAIRE |
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