Gravitational Wave Detection by Laser Interferometry in Space The Project ASTROD

Details Gravitational Wave Detection by Laser Interferometry in Space The Project ASTROD Gravitational Wave Detection by Laser Interferometry in Space The Project ASTROD

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....5.3165r&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

Scientific paper

A Chinese space project ASTROD (Astro dynamical Space Test of Relativity using Optical Devices) is mainly intended for the precise determination of relativistic parameters β , γ , and the solar quadrup ole moment J2 . From one spacecraft near the Earth (Lagrange point L1), the apparent distances to two other spacecraft are monitored, at a time when they simultaneously are on the opposite side of the sun (2 AU away). During the travel of these two distant spacecraft to that constellation, the three spacecraft form a triangle that lends itself to gravitational wave (GW) detection. The arm lengths of between 1 and 2 AU allow GW measurement at frequencies even below 10-5 Hz, significantly below the range covered by the NASA-ESA project LISA. Events involving supermassive black holes may thus become more reliably detectable. Some of the technological challenges of such a low-frequency GW detection will be discussed, and an estimate of the sensitivity will be advanced. A technology demonstrator (Mini-ASTROD) is planned, with only one distant spacecraft, and using a dedicated telescope for the earth station. The spacecraft is to be injected into its final orbit via a double fly-by at Venus. MiniASTROD is now undergoing a Phase-A study; launch will not be until 2008.

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