Gravitational searches for compact dark matter objects

Dark matter could be composed of compact dark objects (CDOs). These objects may interact very weakly with normal matter and could move freely {\it inside} astronomical bodies. We calculate the expected gravitational wave (GW) signal for a CDO merging with a galactic neutron star. We search data from the first advanced LIGO observing run for GWs from close CDO binaries orbiting inside the Sun. A CDO moving in the inner core of the Earth will have an orbital period near 55 min and produce a time dependent signal in a gravimeter. Data from superconducting gravimeters rule out such objects moving inside the Earth unless their mass $m_D$ and or orbital radius $a$ are very small so that $m_D\, a <1.2\times 10^{-13} M_E R_E$. Here $M_E$ and $R_E$ are the mass and radius of the Earth [1912.00940, Phys. Rev. Let. in press].