Ravitational Magnetism: An Update
Gravitational magnetism (or the Blackett effect) is the generation of a magnetic field by an electrically neutral rotating mass, whose magnitude is determined by analogy with the magnetic field generated by a rotating electric charge. Since 1947, there is increasing evidence for this effect by the measurements of the magnetic fields of the solar planets, the sun, other stars, and even pulsars, as well as the galactic magnetic field. However, the attempt to measure this effect in the laboratory depends on the ability to measure extremely weak magnetic fields and the shielding of extraneous magnetic fields. Early attempts to measure this effect in the laboratory depended on ad hoc extensions of the simple rotational version of gravitational magnetism. Recently there have been more sophisticated laboratory approaches. Also the extended observational evidence has generated a plethora of theoretical attempts to derive the Blackett equation in a larger context. Of particular interest is the work of R.I. Gray, who performed an advanced version of Blackett’s static experiment, and also related the Blackett effect to several other theoretical and empirical relations particularly the Wesson effect--the constancy of the ratio of spin to mass-squared for planetary, stellar, and galactic bodies. Pauli’s anomalous magnetic moment (as a Blackett effect) is also considered as a bridge to the gravitomagnetic field generated by superconductors.
KeywordsAnomalous Magnetic Moment Gravitational Magnetism Astronomical Object Nonminimal Coupling Macroscopic Body
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- 9.Smith, P.J. (1981) The Earth as a Magnet, in D. Smith (ed.), The Cambridge Encyclopedia Of Earth Sciences, Cambridge U.P., New York.Google Scholar
- 14.Harasim, A., v. Ludwiger, I., Kroy, W. and Auerbach, H. T. (1988) Laboratory Experiment for Testing Gravi-Magnetic Hypothesis with Squid-Magnetometers, in H.D. Hahlbohm and H. Lubbig (eds.), SQUID’ 85, Superconcuctiong Quantum Interference Devices and their Applications, de Gruyter, Berlin.Google Scholar
- 15.Gray, R.I. (1988) Unified Physics, Naval Surface Warfare Center, Dahlgren, Virginia.Google Scholar
- 17.Salam, A. (1989) Overview of Particle Physics, in P. Davies (ed.) The New Physics, Camb.U.P., New York.Google Scholar
- 18.Brosche, P. (1980) The Mass-Angular Momentum Diagram of Astronomical Objects, in P.G. Bergmann and V. De Sabbata (eds.) Cosmology and Gravitation, Plenum, New York.Google Scholar
- 26.Torr, D. and Li, N. (1993) Gravitoelectric-Electric Coupling via Superconductivity, Found.of Phys. Lett 6:4,71.Google Scholar
- 27.Stirniman, R. (1999) The Wallace Inventions, Spin Aligned Nuclei, the Gravitomagnetic Field, and the Tampere “Gravity-Shielding” Experiment: Is There a Connection? Frontier Perspectives 8:1, 20–25.Google Scholar
- 28.Wilson, J. (2000) Taming Gravity, Popular Mechanics 177:10, 40–42.Google Scholar
- 31.McCrea, W.H. (1978) Magnetism and Rotation: Blackett’s Speculation of 1947, Speculations in Science and Technology, 1:4, 329–338.Google Scholar