期刊
PHYSICAL REVIEW D
卷 101, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.101.063006
关键词
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资金
- Institute for Theory and Computation at Harvard-Smithsonian Center for Astrophysics
- Hong Kong University through the CRF Grants of the Government of the Hong Kong SAR [HKUST4/CRF/13]
- IAS at HKUST
- Universite Paris Diderot
- UnivEarthS Labex program at Sorbonne Paris Cite [ANR-10-LABX-0023, ANR-11-IDEX-0005-02]
- Ministry of Sciences and Technologies, Taiwan [MOST 103-2112-M-002-020-MY3]
- Laboratoire APC-PCCP
- Sorbonne Paris Cite (DXCACHEXGS)
We offer a standing wave explanation for the rising proper motions of stars at the center of the globular cluster 47-Tucanae, amounting to similar or equal to 0.44% of the total mass. We show that this can be explained as a solitonic core of dark matter composed of light bosons, m >= 10(-18) eV, corresponding to <= 0.27 pc, as an alternative to a single black hole (BH) or a concentration of stellar BH remnants proposed recently. This is particularly important because having a concentrated stellar BH remnant with the above radii is very challenging without the heavy core since the three-body encounters would prevent the BHs from being that concentrated. We propose that this core develops from dark matter captured in the deep gravitational potential of this globular cluster as it orbits the dark halo of our Galaxy. This boson may be evidence for a second light axion, additional to a lighter boson of 10(-22) eV, favored for the dominant dark matter implied by the large dark cores of dwarf spheroidal galaxies. The identification of two such light bosonic mass scales favors the generic string theory prediction of a wide, discrete mass spectrum of axionic scalar fields.
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