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

We offer a standing wave explanation for the observed properties of the expected compact dark masses at the center of a very well studied Globular Cluster 47-Tuc representing $\simeq 0.5\%$ of the mass of this compact stellar system. We propose that a soliton composed of light bosons, $ m \geq 1.18 \times 10^{-18} eV $, should develop in the deep gravitational potentials of 47-Tuc orbiting within the dark halo of our galaxy. This would add to the dominant universal dark matter that is increasingly interpreted as a lighter boson of $10^{-22}eV$, implied by the large dark cores of dwarf spheroidal galaxies. Identification of two such light bosonic mass scales of $10^{-18}eV$ and $10^{-22}eV$, favors a generic string theory prediction as dimensional compactification generates a wide, discrete mass spectrum of axionic scalar fields.