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Measuring fN force variations in the presence of constant nN forces: a torsion pendulum ground test of the LISA Pathfinder free-fall mode

Russano, G.; Cavalleri, A.; Cesarini, A. +11 more

LISA Pathfinder is a differential accelerometer with the main goal being to demonstrate the near perfect free-fall of reference test masses, as is needed for an orbiting gravitational wave observatory, with a target sensitivity of 30 fm s^-2 Hz^-1/2 at 1 mHz. Any lasting background differential acceleration between the two test…