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A Soliton Solution for the Central Dark Masses in Globular Clusters and Implications for the Axiverse

Date of publication: 

2018-06-12 16:00:00

Author: 

Razieh Emami, Tom Broadhurst, George Smoot, Tzihong Chiueh, Luu Hoang Nhan

Compact dark masses of ≃2000M⊙ have been derived at the centers of well studied globular clusters orbiting our galaxy, representing ≃0.1% of the mass of these compact stellar systems. It is tempting to conclude these dark masses are long sought examples of "intermediate mass" black holes (IMBH), although no confirming radio/X-ray emission is detected and extended sizes of ≃0.09 pc are permitted by the observations that are much larger than the Schwartzchild radius (≃3×10−4 pc). Here we offer a standing wave explanation for the observed properties of these dark objects, corresponding to a soliton of light bosons, m18=(7.705±7.125)eV, that should develop in the deep gravitational potentials of globular clusters orbiting within the dark halo of our galaxy, from the presence a only a small fraction, ≃10−2, of the dark matter in this form. This would add to the dominant Universal dark matter that is increasingly interpreted as a lighter boson of 10−22eV, implied by the large dark cores of dwarf spheroidal galaxies. Identification of two such light bosonic mass scales of 10−18eV and 10−22eV, favors a generic string theory prediction as dimensional compactification generates a wide, discrete mass spectrum of axionic scalar fields. Observations with improved resolution can test this important theory for the dark matter by resolving our predicted soliton scale, below ≃0.1 pc

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