Speaker
Description
A population of wide-separation binary star systems can be susceptible to small-scale gravitational perturbations, including those from dark matter. Bosonic stars are spatially extended objects that can not be treated as point particles. We give a fully analytic calculation for the tidal perturbation from randomly distributed diffuse objects, and derive a form factor that fully take account of the size effect of solitons. We then discuss their evaporation effects on isolated, a.k.a. halo-like' wide binary systems in our Galaxy, and identify high-probabilityhalo-like' candidates from GAIA with separations larger than 0.1 pc. Survival of the farest-separated candidates will provide a novel gravitational probe to dark matter in the form of solitons. In the case of axion-like solitons, the observational sensitivity is shown to extend into the axion mass range of m_a ~ 10^-15 - 10^-17 eV.
