A similar mission, in terms of the frequency band it seeks to cover, is the US Big Bang Observer (BBO) (see [122, 124, 167] for overviews of the proposal). One of its main aims will be to detect the stochastic background from the early universe, but it can also be used for high precision cosmology . The current configuration would consist of three LISA-like constellations of three spacecraft each, with 50 000 km arm lengths, and separated in their orbit by 120°. The launch of this mission would be after DECIGO, but is designed to be 2 – 3 times as sensitive.
At lower frequencies than LISA, 0.1 µHz – 1 mHz, there are Chinese proposals for Super-ASTROD (Super Astrodynamical Space Test of Relativity using Optical Devices) .
Living Rev. Relativity 14, (2011), 5
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