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

DeSalvo, R.

doi:10.1016/j.physleta.2015.02.032

Cited by 3 publications

(2 citation statements)

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“…For the absolute difference between the observed results and our result, |G1 − G0|, the largest is [29] and resulting in the current performance evaluation outputs may not be firmly reliable. To explain this in another way: although there is difference between our theory and experiment, without clear evidence, we cannot attribute this discrepancy to possible bias of the experimental values.…”

Section: Performance Evaluation Of Our Calculated Gravitational Constant By the Field Observed Datacontrasting

confidence: 77%

A Possible Exact Solution for the Newtonian Constant of Gravity

2016

BJMCS

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Compared with our knowledge of other fundamental constants, the exact value of the Newtonian constant of gravity (G) has long been enigmatic, and there is currently no officially accredited exact solution for G. Different from the widely adopted experimental approach and unlike other theoretical ways in resolving the value of G, by applying to the field equation of general relativity two newly developed tensor-based mathematical approaches (one is referred to as "eigen-modulus" to show the converging ability of a tensor, the other is called "the law of tensorial determination" to evaluate indeterminate forms involving tensors), we provide a possible exact solution to G that only relates to the electrical permittivity (ϵ0) and magnetic permeability (µ0) of free space, and. η is the corresponding mass density with constant value, with η = 1 (kg•m −3 ). This research casts doubt on the prevailing hypothesis that G is an independent constant. Our finding may place the theory of gravity and many related researches on a more objective and quantitative footing. The result not only affects the theory of gravity but also plays a key role in maintaining theories of classical mechanics, cosmology, general relativity and astrophysics.

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Section: Performance Evaluation Of Our Calculated Gravitational Constant By the Field Observed Datacontrasting

confidence: 77%

A Possible Exact Solution for the Newtonian Constant of Gravity

2016

BJMCS

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“…Fourth, further study is necessary to understand magneto-mechanical interactions between the torsion bar and the assisting magnets. Fifth, DeSalvo argues that dislocation self-organized criticality (SOC) noise is a limiting noise source for torsion pendulums [22]. However, it might be mitigated through the use of glassy metals.…”

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confidence: 99%

Suspending test masses in terrestrial millihertz gravitational-wave detectors: a case study with a magnetic assisted torsion pendulum

Thrane

Anderson

Levin

et al. 2017

Class. Quantum Grav.

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Current terrestrial gravitational-wave detectors operate at frequencies above 10 Hz. There is strong astrophysical motivation to construct low-frequency gravitational-wave detectors capable of observing 10 mHz-10 Hz signals. While space-based detectors provide one means of achieving this end, one may also consider terretrial detectors. However, there are numerous technological challenges. In particular, it is difficult to isolate test masses so that they are both seismically isolated and freely falling under the influence of gravity at millihertz frequencies. We investigate the challenges of low-frequency suspension in a hypothetical terrestrial detector. As a case study, we consider a Magnetically Assisted Gravitational-wave Pendulum Intorsion (MAGPI) suspension design. We construct a noise budget to estimate some of the required specifications. In doing so, we identify what are likely to be a number of generic limiting noise sources for terrestrial millihertz gravitational-wave suspension systems (as well as some peculiar to the MAGPI design). We highlight significant experimental challenges in order to argue that the development of millihertz suspensions will be a daunting task. Any system that relies on magnets faces even greater challenges. Entirely mechanical designs such as Zöllner pendulums may provide the best path forward.

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