The Holometer: An Instrument to Probe Planckian Quantum Geometry

Kavli Affiliate: Lee McCuller

| First 5 Authors: Aaron Chou, Henry Glass, H. Richard Gustafson, Craig Hogan, Brittany L. Kamai

| Summary:

This paper describes the Fermilab Holometer, an instrument for measuring
correlations of position variations over a four-dimensional volume of
space-time. The apparatus consists of two co-located, but independent and
isolated, 40m power-recycled Michelson interferometers, whose outputs are
cross-correlated to 25 MHz. The data are sensitive to correlations of
differential position across the apparatus over a broad band of frequencies up
to and exceeding the inverse light crossing time, 7.6 MHz. A noise model
constrained by diagnostic and environmental data distinguishes among physical
origins of measured correlations, and is used to verify shot-noise-limited
performance. These features allow searches for exotic quantum correlations that
depart from classical trajectories at spacelike separations, with a strain
noise power spectral density sensitivity smaller than the Planck time. The
Holometer in current and future configurations is projected to provide
precision tests of a wide class of models of quantum geometry at the Planck
scale, beyond those already constrained by currently operating gravitational
wave observatories.

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