Ning Li (physicist)

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Ning Li is an American scientist known for her controversial claims about anti-gravity devices. She worked as a physicist at the Center for Space Plasma and Aeronomic Research, University of Alabama in Huntsville, in the 1990s. In 1999, she left the university to form a company, AC Gravity, LLC, to continue anti-gravity research.

Anti-gravity claims[edit]

In a series of papers co-authored with fellow university physicist Douglas Torr and published between 1991 and 1993, she claimed a practical way to produce anti-gravity effects. She claimed that an anti-gravity effect could be produced by rotating ions creating a gravitomagnetic field perpendicular to their spin axis. In her theory, if a large number of ions could be aligned, (in a Bose–Einstein condensate) the resulting effect would be a very strong gravitomagnetic field producing a strong repulsive force. The alignment may be possible by trapping superconductor ions in a lattice structure in a high-temperature superconducting disc. Li claimed that experimental results confirmed her theories.[1][2][3] Her claim of having functional anti-gravity devices was cited by the popular press and in popular science magazines with some enthusiasm at the time.[4][5] However in 1997 Li published a paper describing an experiment that showed the effect was very small, if it existed at all.[6]

Li is reported to have left the University of Alabama in 1999 to found the company AC Gravity LLC. AC Gravity was awarded a U.S. DOD grant for $448,970 in 2001 to continue anti-gravity research. The grant period ended in 2002 but no results from this research were ever made public.[7] Although no evidence exists that the company ever performed any other work, as of 2014, AC Gravity still remains listed as an "existent" business.[8] The last public communications from Li were in 2003.[9] No working devices based on her research were ever publicly demonstrated or independently reviewed.[10]

See also[edit]


  1. ^ Li, Ning; Torr, DG (January 15, 1991). "Effects of a gravitomagnetic field on pure superconductors". Physical Review D43: 457–459. doi:10.1103/PhysRevD.43.457. Retrieved March 6, 2014. 
  2. ^ Li, Ning; Torr, DG (September 1, 1992). "Gravitational effects on the magnetic attenuation of superconductors". Physical Review B46: 5489. doi:10.1103/PhysRevB.46.5489. Retrieved March 6, 2014. 
  3. ^ Li, Ning; Torr, DG (August 1, 1993). "Gravito-electric coupling via superconductivity". Foundations of Physics Letters 6 (4): 371–383. doi:10.1007/BF00665654. Retrieved March 6, 2014. 
  4. ^ Wilson, Jim (October 1, 2000). "Taming Gravity". Popular Mechanics (HighBeam Reseatch). Retrieved January 5, 2014. 
  5. ^ Cain, Jeanette. "Gravity Conquered?". Retrieved January 5, 2014. 
  6. ^ N. Li, D. Noever, T. Robertson, R. Koczor and W. Brantley (August 1997). "Static Test for a Gravitational Force Coupled to Type II YBCO Superconductors". Physica C 281 (2-3): 260–267. 
  7. ^ "Annual Report on Cooperative Agreements and Other Transactions Entered into During FY2001 Under 10 USC 2371". DOD. p. 66. Retrieved March 6, 2014. 
  8. ^ "Business Entity Details, AC Gravity, LLC". Alabama, Secretary of State. Retrieved March 6, 2014. 
  9. ^ "Mitre Corporation Conference related to Exotic WMD". June 10, 2003. Retrieved March 6, 2014. 
  10. ^ "Ning Li - AC Gravity, LLC". zoominfo. Retrieved March 6, 2014. 

External links[edit]