What position are the BOSEMs in LIGO measuring?
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As I understand it, the quadruple pendulum of LIGO is also actively positioned, in addition to the seismic damping of the ISI. What I don't understand is: relative to what are the BOSEM sensors measuring the position? Relative to the ground would make no sense, since it is "moving" (that's the point of the seismic isolation, right?). Relative to the other mirror? If so, why would it not also "correct" the displacement due to a GW?
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Hey dear here is the answer
Eastern Daylight Time (09:51 UTC), the twin Laser Interferometer Gravitational-wave Observatory (LIGO) detectors, located in Livingston, Louisiana, and Hanford, Washington, USA both measured ripples in the fabric of spacetime – gravitational waves – arriving at the Earth from a cataclysmic event in the distant universe ...
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Eastern Daylight Time (09:51 UTC), the twin Laser Interferometer Gravitational-wave Observatory (LIGO) detectors, located in Livingston, Louisiana, and Hanford, Washington, USA both measured ripples in the fabric of spacetime – gravitational waves – arriving at the Earth from a cataclysmic event in the distant universe ...
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