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What is DECIGO?

DECIGO stands for DECi-hertz Interferometer Gravitational wave Observatory. It is a gravitational wave antenna in space operating in the 0.1 - 10 Hz frequency band.  We propose DECIGO as the Japanese detector to be built after the ground-based detector KAGRA.


Objectives of DECIGO

The primary objective of DECIGO is to directly observe the beginning of the universe (10-36-10-34 sec after the beginning), and thus possibly reveal its mysterious origin. This is possible only by detecting gravitational waves, because electromagnetic waves cannot give us direct information about the first 380,000 years. Other objectives are to measure the acceleration of the expansion of the universe to further characterize the dark energy, and to observe the formation of giant black holes in the center of galaxies.


Design of DECIGO

DECIGO consists of three drag-free spacecraft, 1,000 km apart from each other. A drag-free spacecraft is a spacecraft which moves according to only gravity, but not solar radiation pressure, etc.; we can realize this by controlling the relative position of the outer spacecraft with respect to a proof mass inside. DECIGO measures an infinitesimal change in the distance between the spacecraft caused by gravitational wave using a laser interferometer.