# Fundamental constants: A cool way to measure big G

@article{Schlamminger2014FundamentalCA, title={Fundamental constants: A cool way to measure big G}, author={Stephan Schlamminger}, journal={Nature}, year={2014}, volume={510}, pages={478-480} }

Published results of the gravitational constant, a measure of the strength of gravity, have failed to converge. An approach that uses cold atoms provides a new data point in the quest to determine this fundamental constant. See Letter p.518
The Newtonian gravitational constant G, also known as the universal gravitational constant or 'big G', is a fundamental physical constant that is used in the calculation of gravitational attraction between two bodies. There are several ways to measure G…

## 28 Citations

Measurements of the gravitational constant using two independent methods

- PhysicsNature
- 2018

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.

Precision measurement of the Newtonian gravitational constant

- PhysicsNational science review
- 2020

The history of the G measurement is briefly reviewed, and eleven values of G adopted in CODATA 2014 after 2000 are introduced and the latest two values published in 2018 are introduced using two independent methods.

Progress in Precise Measurements of the Gravitational Constant

- PhysicsAnnalen der Physik
- 2019

The Newtonian gravitational constant G, which is one of the earliest fundamental constants introduced by human beings, plays an important role in cosmology, astrophysics, geophysics, metrology, and…

The Mass Gap, Kg, the Planck Constant and the Gravity Gap

- Physics
- 2017

In this paper we discuss and calculate the mass gap. Based on the mass gap we are redefining what a kilogram may truly represent. This enables us to redefine the Planck constant in what we consider…

Two Values Of The Constant G Obtained From Inclining-Pull Projection Method

- PhysicsIndian Journal of Scientific Research
- 2019

The Newtonian gravitational constant is regarded as the most fundamental constant. So far, more than 200 experiments have been done to measure its true value. But large discrepancies in those results…

Planck Quantization of Newton and Einstein Gravitation

- Physics
- 2016

In this paper we rewrite the gravitational constant based on its relationship with the Planck length and based on this, we rewrite the Planck mass in a slightly different form (that gives exactly the…

A dual-magneto-optical-trap atom gravity gradiometer for determining the Newtonian gravitational constant.

- PhysicsThe Review of scientific instruments
- 2021

The design of the G measurement by atom interferometry is detailed, the experimental setup of the atom gravity gradiometer is reported, and a preliminary sensitivity of 3 × 10-9 g/Hz to differential gravity acceleration is obtained.

Unaccounted source of systematic errors in measurements of the Newtonian gravitational constant G

- Physics
- 2015

The Gravitational Constant and the Planck’s Constants Planck is Consistent With Mathematical Atomism A Deeper Understanding of the Quantum Realm

- Physics, Education
- 2016

In this paper we suggest a new way to write the gravitational constant that makes all of the Planck constants; Planck length, Planck time, Planck mass, and Planck energy much more intuitive and…

Newton’s and Einstein’s Gravity in a New Perspective for Planck Masses and Smaller Sized Objects

- Physics, Education
- 2016

Here we derive Newton’s and Einstein’s gravitational results for any mass less than or equal to a Planck mass. All of the new formulas presented in this paper give the same numerical output as the…

## References

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The precise determination of G is reported using laser-cooled atoms and quantum interferometry to identify the systematic errors that have proved elusive in previous experiments, thus improving the confidence in the value of G.

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Freely falling samples of laser-cooled rubidium atoms are used in a gravity gradiometer to probe the field generated by nearby source masses to measure the Newtonian gravitational constant G based on cold-atom interferometry.

Don't stop the quest to measure Big G

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The search for a theory of quantum gravity that is consistent with quantum electrodynamics is perhaps the most active field of theoretical physics, and the measurement of Big G, the coupling constant in Newton’s law of gravity, is a good place to start.

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The apparatus has been completely rebuilt and extensive tests carried out on the key parameters needed to produce a new value for G, which confirms the discrepancy of the results with the CODATA value and highlights the wide divergence that now exists in recent values of G.

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We determined the Newtonian constant of gravitation G by interferometrically measuring the change in spacing between two free-hanging pendulum masses caused by the gravitational field from large…

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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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This Letter presents the results of a series of measurements of the Newtonian gravitational constant G using the compensated torsion balance developed at the Measurement Standards Laboratory. Since…

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Newton's gravitational constant G is measured using a new torsion balance method that is insensitive to anelastic torsions fiber properties, and a flat plate pendulum minimizes the sensitivity due to the pendulum density distribution.

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The result of a measurement of G made with a torsion-strip balance used in two substantially independent ways is presented, with a standard uncertainty of 4.1 parts in 10(5).