A Soliton Solution for the Central Dark Masses in 47- Tuc Globular Cluster and Implications for the Axiverse

Abstract

We offer a standing wave explanation for the rising proper motions of stars at the center of the globular cluster 47-Tucanae, amounting to $\simeq 0.44\%$ of the total mass. We show this can be explained as a solitonic core of dark matter composed of light bosons, $m\ge 10^{-18}eV$, corresponding to $\le 0.27pc$, as an alternative to a single black hole (BH) or a concentration of stellar BH remnants proposed recently. This is particularly important as 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 to be that concentrated. We propose 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.

arXiv comment6 Pages, 4 Figures. Accepted for publication in PRD

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Cited by in corpus (10)

• The Subhalo Mass Function and Ultralight Bosonic Dark Matter
• Looking for ultralight dark matter near supermassive black holes
• Ultra-light dark matter in disk galaxies
• Baryon-driven growth of solitonic cores in fuzzy dark matter halos
• Multiple Ultralight Axionic Wave Dark Matter and Astronomical Structures
• Gravitational waves from binary black holes in a self-interacting scalar dark matter cloud
• Supersonic friction of a black hole traversing a self-interacting scalar dark matter cloud
• Implications of multi-axion dark matter on structure formation
• Evolution of perturbation and power spectrum in a two-component ultralight axionic universe
• Dark matter halos modeled by polytropic spheres influenced by the relict cosmological constant and trapping polytropes forming supermassive black holes