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The mass of the photon
Because classical Maxwellian electromagnetism has been one of the cornerstones of physics during the past century, experimental tests of its foundations are always of considerable interest. Within…
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Measurements of the gravitational constant using two independent methods
TLDR
Two independent determinations of G are reported using torsion pendulum experiments with the time-of-swing method and the angular-acceleration-feedback method, yielding results with relative standard uncertainties of 11.6 parts per million—the lowest uncertainty reported until now.
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New experimental limit on the photon rest mass with a rotating torsion balance.
TLDR
A rotating torsion balance method is used to detect the product of the photon mass squared and the ambient cosmic vector potential A(e), and the experimental result shows micro (2)(gamma)A(e)<1.1 x 10(-11) T m/m(2), with micro (-1)(Gamma) as the characteristic length associated with photon mass.
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Improvement for Testing the Gravitational Inverse-Square Law at the Submillimeter Range.
TLDR
This work establishes the strongest bound on the magnitude α of the Yukawa violation in the range of 40-350  μm, and improves the previous bounds by up to a factor of 3 at the length scale λ≈70‬‬μm.
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The TianQin project: Current progress on science and technology
TianQin is a planned space-based gravitational wave (GW) observatory consisting of three Earth-orbiting satellites with an orbital radius of about $10^5 \, {\rm km}$. The satellites will form an…
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Test of the gravitational inverse square law at millimeter ranges.
TLDR
This work establishes the most stringent constraints on non-Newtonian interaction in the ranges from 0.7 to 5.0 mm, and a factor of 8 improvement is achieved at the length scale of several millimeters.
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Determination of the Newtonian gravitational constant G with time-of-swing method.
TLDR
Improvements greatly reduce the uncertainties of the Newtonian gravitational constant G by measuring the anelasticity of the fiber directly and using a quartz block pendulum, which simplifies its vibration modes and minimizes the uncertainty of inertial moment.
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New determination of the gravitational constant G with time-of-swing method
A new determination of the Newtonian gravitational constant G is presented by using a torsion pendulum with the time-of-swing method. Compared with our previous measurement with the same method,…
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Experimental tests of Coulomb's Law and the photon rest mass
Coulomb's Law is a fundamental principle describing the electric force between isolated charges, and represents the first quantitative law achieved in electromagnetism. The degree of confidence with…
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The first round result from the TianQin-1 satellite
The TianQin-1 satellite (TQ-1), which is the first technology demonstration satellite for the TianQin project, was launched on 20 December 2019. The first round of experiment had been carried out…
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