Kavli Affiliate: Rainer Weiss
| Summary:
Precision measurements are reported of the cross-spectrum of rotationally-induced differential position displacements in a pair of colocated 39 m long, high power Michelson interferometers. One arm of each interferometer is bent $90^circ$ near its midpoint to obtain sensitivity to rotations about an axis normal to the plane of the instrument. The instrument achieves quantum-limited sensing of spatially-correlated signals in a broad frequency band extending beyond the 3.9 MHz inverse light travel time of the apparatus. For stationary signals with bandwidth $Δf > 10;mathrmkHz$, the sensitivity to rotation-induced strain $h$ of classical or exotic origin surpasses $mathrmCSD_δh < t_P / 2$, where $t_P = 5.39 times 10^-44;mathrms$ is the Planck time. This measurement is used to constrain a semiclassical model of nonlocally coherent rotational degrees of freedom of spacetime, which have been conjectured to emerge in holographic quantum geometry but are not present in a classical metric.
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