Using LISA Pathfinder's measured rotational noise, the authors constrain the CSL collapse rate to values roughly a factor of 2 tighter than the existing translational bound for correlation lengths between tens of micrometers and millimeters.
(12) Let us estimate the α ratio for the noise from residual gas, which is believed to be the main source of physical noise in LISA Pathfinder
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Improved bounds on collapse models from rotational noise of LISA Pathfinder
Using LISA Pathfinder's measured rotational noise, the authors constrain the CSL collapse rate to values roughly a factor of 2 tighter than the existing translational bound for correlation lengths between tens of micrometers and millimeters.