A5033538480- Cosmology and Gravitation Theories
- Pulsars and Gravitational Waves Research
- Seismology and Earthquake Studies
- Dark Matter and Cosmic Phenomena
- Quantum, superfluid, helium dynamics
- Noncommutative and Quantum Gravity Theories
- Seismic Waves and Analysis
- Geophysics and Sensor Technology
- Quantum Mechanics and Applications
- Black Holes and Theoretical Physics
- Quantum Electrodynamics and Casimir Effect
- Superconducting Materials and Applications
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Atomic and Subatomic Physics Research
University of Washington
2015-2021
We tested the gravitational $1/r^2$ law using a stationary torsion-balance detector and rotating attractor containing test bodies with both 18-fold 120-fold azimuthal symmetries that simultaneously tests at two different length scales. took data detector-attractor separations between $52~\mu$m 3.0 mm. Newtonian gravity gave an excellent fit to our data, limiting 95\% confidence any gravitational-strength Yukawa interactions ranges $< 38.6~\mu$m.
We used a torsion pendulum and rotating attractor with 20-pole electron-spin distributions to probe dipole-dipole interactions mediated by exotic pseudo-Goldstone bosons m(b)c(2)≤500 μeV coupling strengths up 14 orders of magnitude weaker than electromagnetism. This corresponds symmetry-breaking scales F≤70 TeV, the highest reached in any laboratory experiment. an unpolarized mass distribution improve bounds on CP-violating monopole-dipole forces 1.5 μeV<m(b)c(2)<400 factor 1000.
We describe a torsion pendulum with large mass-quadrupole moment and resonant frequency of 2.8 mHz, whose angle is measured using Michelson interferometer. The system achieved noise levels ∼200prad/Hz between 0.2 30 Hz ∼10prad/Hz above 100 Hz. Such can be applied to broad range fields from the study rotational seismic motion elastogravity signals gravitational wave observation tests gravity.
With a reinterpretation of recent results, the GRACE Follow-On mission can be applied to gravitational wave astronomy. Existing data constrain stochastic background $\Omega_{GW}<3.3\times10^{7}$ at 100 mHz. dedicated analysis, may able detect inspiral local neutron star binaries, subgalactic stellar-mass black hole or mergers intermediate-mass binaries within Milky Way.
Abstract Two Eöt–Wash torsion balance instruments exploited optimized Fourier–Bessel geometries to test the short-distance properties of gravity and constrain exotic dipole–dipole monopole–dipole interactions. We discuss efficient analytic techniques for computing expected torques in those arising from Newtonian Yukawa interactions between unpolarized bodies on polarized test-bodies. consider systematic effects induced by weak external magnetic fields nominally also present a new expansion...