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Scattering events with compact objects are expected in the primordial blackhole (PBH) cold dark matter (CDM) scenario due to close encounters betweenstars and PBH in the dense environments of dwarf spheroidals. We develop aBayesian framework to search for correlations among Milky Way stellartrajectories and those of globular clusters and dwarf galaxies in the halo, andother nearby galaxies. We apply the method to a selection of hypervelocitystars (HVS) and globular clusters from Gaia DR2 catalog, and known nearby(mostly dwarf) galaxies with full phase-space and size measurements. We reportpositive evidence for trajectory intersection $\sim$20-40 Myr ago of up to 2stars, depending on priors, with the Sagittarius dwarf Spheroidal (dSph) galaxywhen assuming Marchetti et al. (2019) distance estimates. We verify that theresult is compatible with their evolutionary status, setting a lower bound forthe stellar age of $\sim$100 Myr. However, such scattering events are notconfirmed when assuming Anders et al. (2019) distance estimates. We discussshortcomings related to present data quality and future prospects for detectionof HVS with the full Gaia catalog and Sagittarius dSph.

Searching for correlations in GAIA DR2 unbound star trajectories