The Japanese space gravitational wave antenna—DECIGO

DECi- hertzInterferometer Gravitational wave Observatory(DECIGO) is the future Japanese space gravitational waveantenna. It aims at detecting various kinds of gravitational wavesbetween 1 mHz and 100 Hz frequently enough to open a new window of observation for gravitational wave astronomy. The pre- conceptual designof DECIGO consists of three drag-free satellites, 1000 km apart from each other, whose relative displacements are measured by a Fabry–Perot Michelson interferometer. We plan to launch DECIGO in 2024 after a long and intense development phase, including two pathfindermissions for verification of required technologies.