This guy is doing some very interesting research on the “Weak gravitational field of the electromagnetic radiation in a ring laser,” and has found that he might be able to use the data collected from this research to develop a time machine, using light.
For the strong gravitational field of a circulating cylinder of light, I have found new exact solutions of the Einstein field equations for the exterior and interior gravitational fields of the light cylinder. The exterior gravitational field is shown to contain closed timelike lines [R. L. Mallett, “The gravitational field of a circulating light beam,” Foundations of Physics 33, 1307 (2003)]. The presence of closed timelike lines indicates the possibility of time travel into the past. This creates the foundation for a time machine based on a circulating cylinder of light.
Here’s some links to read more:
A Brief History of Time Travel – Audio of lecture by Mallett
What Time Is It There? – Article giving a nice background on Mallett and his research
Will UConn Professor Create First Time Machine? – Another article giving details on his theories and background
Ronald Mallett’s Homepage – Just a bio on him and a few links
