The goal of the laser interferometer gravitational-wave observatory (LIGO) project is to detect and study gravitational waves from astrophysical sources. Currently, three interferometers with arm lengths of several kilometres and a design strain sensitivity of order 2 × 10 −23 Hz −1/2 are being commissioned at two independent sites in Hanford (WA) and Livingston (LA). This paper describes the current work towards achieving LIGO's final sensitivity.
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D. Sigg (2002) studied this question.