Gravimeter search for compact dark matter objects moving in the Earth

Understand

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} the Earth.
• 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 $m_D\, a < 1.2\times 10^{-13}M_\oplus R_\oplus$.