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A Tale of Two Calibrators: Comparing Newtonian and Photon Calibration in Advanced LIGO after the Third Observing Run
Dana Jones, Michael P. Ross, Ling Sun +5
Precise calibration of LIGO's strain readout plays a vital role in our ability to extract information from gravitational-wave detections. We present a comparative analysis of two i…
Short-range tests of the equivalence principle
G. L. Smith, C. D. Hoyle, J. H. Gundlach +3
We tested the equivalence principle at short length scales by rotating a 3-ton U attractor around a compact torsion balance containing Cu and Pb test bodies. The observed d…
A Pseudo Plane-wave Gravitational Calibrator for Gravitational Wave Observatories
M. P. Ross, J. H. Gundlach, E. G. Adelberger +8
The precisions of existing gravitational calibrators for gravitational wave observatories are limited by their dependence on the relative position between the calibrators and the o…
Initial Results from the LIGO Newtonian Calibrator
Michael P. Ross, Timesh Mistry, Laurence Datrier +16
The precise calibration of the strain readout of the LIGO gravitational wave observatories is paramount to the accurate interpretation of gravitational wave events. This calibratio…
Limits on the Stochastic Gravitational Wave Background and Prospects for Single Source Detection with GRACE Follow-On
M. P. Ross, C. A. Hagedorn, E. A. Shaw +5
With a reinterpretation of recent results, the GRACE Follow-On mission can be applied to gravitational wave astronomy. Existing GRACE Follow-On data constrain the stochastic gravit…
Recent measurements of the gravitational constant as a function of time
S. Schlamminger, J. H. Gundlach, R. D. Newman
A recent publication (J.D. Anderson et. al., EPL 110, 1002) presented a strong correlation between the measured values of the gravitational constant and the 5.9-year oscillatio…
Torsion-balance tests of the weak equivalence principle
T. A. Wagner, S. Schlamminger, J. H. Gundlach +1
We briefly summarize motivations for testing the weak equivalence principle and then review recent torsion-balance results that compare the differential accelerations of beryllium-…
Brownian force noise from molecular collisions and the sensitivity of advanced gravitational wave observatories
R. Dolesi, M. Hueller, D. Nicolodi +12
We present an analysis of Brownian force noise from residual gas damping of reference test masses as a fundamental sensitivity limit in small force experiments. The resulting accel…
Indirect Evidence for Lévy Walks in Squeeze Film Damping
Stephan Schlamminger, Charles A. Hagedorn, Jens H. Gundlach
Molecular flow gas damping of mechanical motion in confined geometries, and its associated noise, is important in a variety of fields, including precision measurement, gravitationa…
Charge Management for Gravitational Wave Observatories using UV LEDs
S. E. Pollack, M. D. Turner, S. Schlamminger +2
Accumulation of electrical charge on the end mirrors of gravitational wave observatories, such as the space-based LISA mission and ground-based LIGO detectors, can become a source…
Opportunities for Probing Fundamental Gravity with Solar System Experiments
Slava G. Turyshev, Thomas W. Murphy, Eric G. Adelberger +13
The recent discovery of "dark energy" has challenged Einstein's general theory of relativity as a complete model for our macroscopic universe. From a theoretical view, the challeng…
Temporal Extent of Surface Potentials between Closely Spaced Metals
Scott E Pollack, Stephan Schlamminger, Jens Gundlach
Variations in the electrostatic surface potential between the proof mass and electrode housing in the space-based gravitational wave mission LISA is one of the largest contributors…
Test of the Equivalence Principle Using a Rotating Torsion Balance
S. Schlamminger, K. -Y. Choi, T. A. Wagner +2
We used a continuously rotating torsion balance instrument to measure the acceleration difference of beryllium and titanium test bodies towards sources at a variety of distances. O…
High Sensitivity Torsion Balance Tests for LISA Proof Mass Modeling
S. Schlamminger, C. A. Hagedorn, M. G. Famulare +2
We have built a highly sensitive torsion balance to investigate small forces between closely spaced gold coated surfaces. Such forces will occur between the LISA proof mass and its…
Outgassing, Temperature Gradients and the Radiometer Effect in LISA: A Torsion Pendulum Investigation
Scott E Pollack, Stephan Schlamminger, Jens H Gundlach
Thermal modeling of the LISA gravitational reference sensor (GRS) includes such effects as outgassing from the proof mass and its housing and the radiometer effect. Experimental da…
Measurement of Newton's Constant Using a Torsion Balance with Angular Acceleration Feedback
Jens H. Gundlach, Stephen M. Merkowitz
We measured Newton's gravitational constant G using a new torsion balance method. Our technique greatly reduces several sources of uncertainty compared to previous measurements: (1…