Abstract
Boson stars built from a very light Kalb–Ramond axion, the dilaton or other moduli fields of effective string models could provide a considerable fraction of the non-baryonic part of dark matter. Gravitational microlensing of ∼0.5 M⊙ MACHOs within the halo of galaxies may indirectly "weighing" the mass of the constituent scalar particle, resulting in ∼10−10 eV/c2.
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Mielke, E.W., Schunck, F.E. Are Axidilaton Stars Massive Compact Halo Objects?. General Relativity and Gravitation 33, 805–813 (2001). https://doi.org/10.1023/A:1010251707026
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DOI: https://doi.org/10.1023/A:1010251707026