Space gravitational-wave antennas DECIGO and B-DECIGO
2018
Since the direct detection of
gravitational wavewill give us a fruitful insight about the early universe or life of stars, laser
interferometric gravitational wave detectorswith the strain sensitivity of higher than 10−22 have been developed. In Japan, the space
gravitational wavedetector project named
DECi-
hertz
Gravitational wave Observatory(DECIGO) has been promoted which consists of three satellites forming
equilateral triangle-shaped Fabry–Perot laser interferometer with the arm length of 1000 km. The designed strain sensitivity of DECIGO is 2 × 10−24/√Hz around 0.1 Hz whose targets are
gravitational wavesoriginated from the inspiral and the merger of black hole or neutron star binaries and from the inflation at the early universe, and no ground-based
gravitational wavedetector can access this observation band. Before launching DECIGO in 2030s, a milestone mission named B-DECIGO is planned which is a downsized mission of DECIGO. B-DECIGO also has its own scientific targets in addition to the feasibility test for DECIGO. In the present paper, DECIGO and B-DECIGO projects are reviewed.
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