期刊
PHYSICAL REVIEW LETTERS
卷 124, 期 20, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.124.201301
关键词
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资金
- Ministry of Science and Technology (MOST) of Taiwan [MOST 107-2119-M-002-036-MY3, MOST 108-2112-M-002-023-MY3]
- NTU Core Consortium project [NTU-CC108L893401, NTU-CC-108L893402]
- Jade Mountain Young Scholar Award - Ministry of Education, Taiwan [NTU-108V0201]
Simulations of ultralight, similar to 10(-22) eV, bosonic dark matter exhibit rich wavelike structure, including a soliton core within a surrounding halo that continuously self-interferes on the de Broglie scale. We show here that as an inherent consequence, the soliton undergoes a confined random walk at the base of the halo potential. This is significant for the fate of the ancient central star cluster in Eridanus II, as the agitated soliton gravitationally shakes the star cluster in and out of the soliton on a timescale of similar to 100 Myr, so complete tidal disruption of the star cluster can occur within similar to 1 Gyr. This destructive effect can be mitigated by tidal stripping of the halo of Eridanus II, thereby reducing the agitation, depending on its orbit around the Milky Way. Our simulations show the Milky Way tide affects the halo much more than the soliton, so the star cluster in Eridanus II can survive for over 5 Gyr within the soliton if it formed after significant halo stripping.
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