Comments on “Gravitoelectric-Electric Coupling via Superconductivity“ by Douglas G. Torr and Ning Li


Torr and Li claim to have shown that experimentally detectable gravitomagnetic and gravitoelectric fields can be generated in a superconductor. We review their calculations and show that because of unrealistic assumptions the fields that they calculate are too large by many orders of magnitude.

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  1. 1.

    Douglas G. Torr and Ning Li, “Gravitoelectric-electric coupling via superconductivity,” Found Phys. Lett. 6, 371 (1993).

    Article  Google Scholar 

  2. 2.

    N. Li and D. G. Torr, “Effects of a gravitomagnetic field on pure superconductors,” Phys. Rev. D 43, 457 (1991).

    ADS  Article  Google Scholar 

  3. 3.

    N. Li and D. G. Torr, “Gravitational effects on the magnetic attenuation of superconductors,” Phys. Rev. D 46, 5489 (1992).

    ADS  Article  Google Scholar 

  4. 4.

    E. G. Harris, “Analogy between general relativity and electromagnetism for slowly moving particles in weak gravitational fields,” Am. J. Phys. 59, 421 (1991).

    ADS  MathSciNet  Article  Google Scholar 

  5. 5.

    Ning Li, D. G. Torr, and Francis A. Karwacki, “Lattice ion rotations and the dipole gravitomagnetic field of superconductors,” preprint from the University of Alabama at Huntsville, July 21, 1994.

    Google Scholar 

  6. 6.

    Robert Matthews, “Antigravity machine weighed down by controversity,” New Scientist, 21 September 1996.

  7. 7.

    Robert Matthews and Ian Sample, “Breakthrough as scientists beat gravity,” The Sunday Telegraph, London, 1 September 1996.

  8. 8.

    E. Podkletnov and R. Nieminen, “A possibility of gravitational force shielding by bulk YBa2Cu3O7-x superconductor,” Physica C 203, 441 (1996).

    ADS  Article  Google Scholar 

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Correspondence to Edward G. Harris.

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Harris, E.G. Comments on “Gravitoelectric-Electric Coupling via Superconductivity“ by Douglas G. Torr and Ning Li. Found Phys Lett 12, 201–208 (1999).

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  • gravity
  • gravitomagnetism
  • superconductivity