Ning Li (physicist)

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][4] 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.[5][6] In 1997 Li published a paper stating that recent experiments reported anomalous weight changes of 0.05-2.1% for a test mass suspended above a rotating superconductor. Although the same paper describes another experiment that showed the gravitational effect of a non rotating superconductor was very small, if any effect existed at all.[7]

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.[8] No evidence exists that the company performed any other work, although as of 2021, AC Gravity still remains listed as an extant business.[9]

On July 27, 2021, Ning Li died at the age of 78.[10]

• Eugene Podkletnov

• Breaking the Law of Gravity A 1998 Wired magazine article reviewing her work, as well as others.
• Bose-Einstein and Anti-Gravity (Archived May 1, 2018, at the Wayback Machine) A narrative of Li's theory of operation and her future plans from the 1990s.