Search for Gravitational Signals of Collapsing Objects in the Galaxy

Monitoring of pulsed disturbances of the ground background of the gravitational gradient generated by both astrophysical and intra-terrestrial cataclysms was performed. The main goal was to register bursts of gravitational radiation from relativistic catastrophes in the Galaxy, as well as hidden explosive processes of the internal terrestrial structures. Experimental studies were carried out using the OGRAN optoacoustical gravitational antenna, the VIRGO gravitational interferometer and auxiliary seismic equipment in the main tunnel of the BNO INR RAS. Measurements of the balance of acoustic, optical and electronic noises of the OGRAN antenna in relation to the noise of the environment were performed. Measurements of the seismic background in the main tunnel of the BNO in the low-frequency range from 0.1 Hz to 10 Hz were carried out. The processing of long-term measurements of low-frequency gravity gradient disturbances on the VIRGO laser gravitational interferometer with a 3 km base was completed. A majorizing estimate of the magnitude of disturbances for oscillations of the inner Earth’s core was obtained. The set of problems solved in this project demonstrates its multidisciplinary nature, providing new knowledge in the fields of: astrophysics (refining the physical processes during stellar mergers and collapses), nuclear physics (refining the equations of state of neutron stars) and geodynamics (processes of the inner earth and seismoacoustics).