Mathematics – Logic
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.3212b&link_type=abstract
American Astronomical Society, HEAD meeting #11, #32.12; Bulletin of the American Astronomical Society, Vol. 41, p.705
Mathematics
Logic
Scientific paper
The scientific case for early flight of a first space GW mission to observe the signals from massive black hole mergers throughout the universe and from inspirals of stellar mass black holes into galactic center black holes appears to be strong. But, the justification for a second space GW mission will depend strongly on what the first one finds. The Big Bang Observer and DECIGO missions have been proposed, with their objectives including looking for primordial GW signals and helping to determine the cosmological distance scale. However, these missions are extremely challenging, so whether they will be scientifically justified in the future is quite uncertain. Future progress toward achieving similar objectives appears likely from ground observations and from one of the several Cosmic Microwave Background Polarization missions that have been proposed.
Two much more modest missions have been suggested for study, in addition to the Laser Interferometer Space Antenna (LISA) mission and the LISA and DECIGO pathfinder missions. One is called pre-DECIGO, which would combine looking for NS-NS inspirals out to 300 Mpc with technology demonstrations for DECIGO. The other is called the Advanced Laser Interferometer Antenna (ALIA), and would extend observations of stellar mass and intermediate mass black hole mergers out to considerably larger redshifts. The suggested baselines are 100 km and 500,000 km, and the required spurious acceleration limits are 1x10-17 and 3x10-16 m/s2/sqrt Hz, respectively.
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