The Japanese space gravitational wave antenna; DECIGO

DECi-hertz Interferometer Gravitational wave Observatory (DECIGO) is the future
\nJapanese space gravitational wave antenna. DECIGO is expected to open a new window of
\nobservation for gravitational wave astronomy especially between 0.1 Hz and 10 Hz, revealing
\nvarious mysteries of the universe such as dark energy, formation mechanism of supermassive
\nblack holes, and inflation of the universe. The pre-conceptual design of DECIGO consists of
\nthree drag-free spacecraft, whose relative displacements are measured by a differential Fabry–
\nPerot Michelson interferometer. We plan to launch two missions, DECIGO pathfinder and pre-
\nDECIGO first and finally DECIGO in 2024.